SQL: Implement CURRENT_DATE (#38175)

Since DATE data type is now available, this implements the
`CURRENT_DATE/CURRENT_DATE()/TODAY()` similar to `CURRENT_TIMESTAMP`.

Closes: #38160

docs/reference/sql/functions/date-time.asciidoc

@@ -93,6 +93,48 @@ include-tagged::{sql-specs}/docs.csv-spec[dtIntervalMul]
 
 beta[]
 
+[[sql-functions-current-date]]
+==== `CURRENT_DATE/CURDATE`
+
+.Synopsis:
+[source, sql]
+--------------------------------------------------
+CURRENT_DATE
+CURRENT_DATE()
+--------------------------------------------------
+
+*Input*: _none_
+
+*Output*: date
+
+.Description:
+
+Returns the date (no time part) when the current query reached the server.
+It can be used both as a keyword: `CURRENT_DATE` or as a function with no arguments: `CURRENT_DATE()`.
+
+[NOTE]
+Unlike CURRENT_DATE, `CURDATE()` can only be used as a function with no arguments and not as a keyword.
+
+This method always returns the same value for its every occurrence within the same query.
+
+["source","sql",subs="attributes,callouts,macros"]
+--------------------------------------------------
+include-tagged::{sql-specs}/docs.csv-spec[curDate]
+--------------------------------------------------
+
+["source","sql",subs="attributes,callouts,macros"]
+--------------------------------------------------
+include-tagged::{sql-specs}/docs.csv-spec[curDateFunction]
+--------------------------------------------------
+
+Typically, this function (as well as its twin <<sql-functions-today,TODAY())>> function
+is used for relative date filtering:
+
+["source","sql",subs="attributes,callouts,macros"]
+--------------------------------------------------
+include-tagged::{sql-specs}/docs.csv-spec[filterToday]
+--------------------------------------------------
+
 [[sql-functions-current-timestamp]]
 ==== `CURRENT_TIMESTAMP`
 
@@ -115,7 +157,7 @@ Returns the date/time when the current query reached the server.
 As a function, `CURRENT_TIMESTAMP()` accepts _precision_ as an optional
 parameter for rounding the second fractional digits (nanoseconds).
 
-This method always returns the same value within a query.
+This method always returns the same value for its every occurrence within the same query.
 
 ["source","sql",subs="attributes,callouts,macros"]
 --------------------------------------------------
@@ -422,7 +464,8 @@ NOW()
 .Description:
 
 This function offers the same functionality as <<sql-functions-current-timestamp,CURRENT_TIMESTAMP()>> function: returns
-the datetime when the current query reached the server. This method always returns the same value within a query.
+the datetime when the current query reached the server. This method always returns the same value for its every
+occurrence within the same query.
 
 ["source","sql",subs="attributes,callouts,macros"]
 --------------------------------------------------
@@ -485,6 +528,38 @@ Extract the year quarter the date/datetime falls in.
 include-tagged::{sql-specs}/docs.csv-spec[quarter]
 --------------------------------------------------
 
+[[sql-functions-today]]
+==== `TODAY`
+
+.Synopsis:
+[source, sql]
+--------------------------------------------------
+TODAY()
+--------------------------------------------------
+
+*Input*: _none_
+
+*Output*: date
+
+.Description:
+
+This function offers the same functionality as <<sql-functions-current-date,CURRENT_DATE()>> function: returns
+the date when the current query reached the server. This method always returns the same value for its every occurrence
+within the same query.
+
+["source","sql",subs="attributes,callouts,macros"]
+--------------------------------------------------
+include-tagged::{sql-specs}/docs.csv-spec[todayFunction]
+--------------------------------------------------
+
+Typically, this function (as well as its twin <<sql-functions-current-timestamp,CURRENT_TIMESTAMP())>> function is used
+for relative date filtering:
+
+["source","sql",subs="attributes,callouts,macros"]
+--------------------------------------------------
+include-tagged::{sql-specs}/docs.csv-spec[filterToday]
+--------------------------------------------------
+
 [[sql-functions-datetime-week]]
 ==== `WEEK_OF_YEAR/WEEK`
 

x-pack/plugin/sql/qa/src/main/java/org/elasticsearch/xpack/sql/qa/cli/ShowTestCase.java

@@ -91,6 +91,7 @@ public abstract class ShowTestCase extends CliIntegrationTestCase {
         assertThat(readLine(), RegexMatcher.matches("\\s*ISODAYOFWEEK\\s*\\|\\s*SCALAR\\s*"));
         assertThat(readLine(), RegexMatcher.matches("\\s*ISO_DAY_OF_WEEK\\s*\\|\\s*SCALAR\\s*"));
         assertThat(readLine(), RegexMatcher.matches("\\s*MINUTE_OF_DAY\\s*\\|\\s*SCALAR\\s*"));
+        assertThat(readLine(), RegexMatcher.matches("\\s*TODAY\\s*\\|\\s*SCALAR\\s*"));
         assertEquals("", readLine());
     }
 }

x-pack/plugin/sql/qa/src/main/resources/command.csv-spec

@@ -31,6 +31,8 @@ ISNULL           |CONDITIONAL
 LEAST            |CONDITIONAL
 NULLIF           |CONDITIONAL
 NVL              |CONDITIONAL
+CURDATE          |SCALAR
+CURRENT_DATE     |SCALAR
 CURRENT_TIMESTAMP|SCALAR
 DAY              |SCALAR
 DAYNAME          |SCALAR
@@ -65,7 +67,8 @@ MONTH_OF_YEAR    |SCALAR
 NOW              |SCALAR
 QUARTER          |SCALAR         
 SECOND           |SCALAR         
-SECOND_OF_MINUTE |SCALAR         
+SECOND_OF_MINUTE |SCALAR
+TODAY            |SCALAR
 WEEK             |SCALAR         
 WEEK_OF_YEAR     |SCALAR         
 YEAR             |SCALAR         
@@ -175,6 +178,7 @@ HOUR_OF_DAY    |SCALAR
 ISODAYOFWEEK   |SCALAR
 ISO_DAY_OF_WEEK|SCALAR
 MINUTE_OF_DAY  |SCALAR         
+TODAY          |SCALAR
 ;
 
 showTables

x-pack/plugin/sql/qa/src/main/resources/date.csv-spec

@@ -2,6 +2,73 @@
 // Date
 //
 
+currentDateKeywordWithDivision
+SELECT YEAR(CURRENT_TIMESTAMP) / 1000 AS result;
+
+    result
+---------------
+2
+;
+
+currentDateFunctionNoArgsWithDivision
+SELECT YEAR(CURRENT_TIMESTAMP()) / 1000 AS result;
+
+    result
+---------------
+2
+;
+
+todayWithDivision
+SELECT YEAR(TODAY()) / 1000 AS result;
+
+    result
+---------------
+2
+;
+
+todayIntervalSubstraction
+SELECT TRUNCATE(YEAR(TODAY() - INTERVAL 50 YEARS) / 1000) AS result;
+
+    result
+---------------
+1
+;
+
+
+currentDateFilter
+SELECT first_name FROM test_emp WHERE hire_date > CURRENT_DATE() - INTERVAL 25 YEARS ORDER BY first_name ASC LIMIT 10;
+
+    first_name
+-----------------
+Kazuhito
+Kenroku
+Lillian
+Mayumi
+Mingsen
+Sailaja
+Saniya
+Shahaf
+Suzette
+Tuval
+;
+
+currentDateFilterScript
+SELECT first_name, TRUNCATE(YEAR(hire_date) - YEAR(TODAY()) / 1000) AS filter FROM test_emp
+WHERE TRUNCATE(YEAR(hire_date) - YEAR(TODAY()) / 1000) > 1990 ORDER BY first_name ASC LIMIT 10;
+
+  first_name   |  filter
+Cristinel      |1991
+Kazuhito       |1993
+Kenroku        |1992
+Lillian        |1997
+Magy           |1991
+Mayumi         |1993
+Mingsen        |1992
+Sailaja        |1994
+Saniya         |1992
+Shahaf         |1993
+;
+
 dateExtractDateParts
 SELECT
 DAY(CAST(birth_date AS DATE)) d,
@@ -75,3 +142,23 @@ SELECT YEAR(CAST('2019-01-21' AS DATE) + INTERVAL '1-2' YEAR TO MONTH) AS y, MON
 y:i       | m:i
 2020      | 3
 ;
+
+orderByCurrentDate
+SELECT first_name FROM test_emp ORDER BY TODAY(), first_name LIMIT 5;
+
+  first_name
+---------------
+Alejandro
+Amabile
+Anneke
+Anoosh
+Arumugam
+;
+
+groupByCurrentDate
+SELECT MAX(salary) FROM test_emp GROUP BY TODAY();
+
+  MAX(salary)
+---------------
+74999
+;

x-pack/plugin/sql/qa/src/main/resources/datetime.sql-spec

@@ -120,6 +120,12 @@ SELECT DAY_OF_WEEK(birth_date) day, COUNT(*) c FROM test_emp WHERE DAY_OF_WEEK(b
 currentTimestampYear
 SELECT YEAR(CURRENT_TIMESTAMP()) AS result;
 
+orderByCurrentTimestamp
+SELECT first_name FROM test_emp ORDER BY NOW(), first_name NULLS LAST LIMIT 5;
+
+groupByCurrentTimestamp
+SELECT MAX(salary) AS max FROM test_emp GROUP BY NOW();
+
 //
 // H2 uses the local timezone instead of the specified one
 //
@@ -131,3 +137,4 @@ SELECT HOUR(CURRENT_TIMESTAMP()) AS result;
 
 currentTimestampMinute-Ignore
 SELECT MINUTE(CURRENT_TIMESTAMP()) AS result;
+

x-pack/plugin/sql/qa/src/main/resources/docs.csv-spec

@@ -208,6 +208,8 @@ ISNULL           |CONDITIONAL
 LEAST            |CONDITIONAL
 NULLIF           |CONDITIONAL
 NVL              |CONDITIONAL
+CURDATE          |SCALAR
+CURRENT_DATE     |SCALAR
 CURRENT_TIMESTAMP|SCALAR
 DAY              |SCALAR
 DAYNAME          |SCALAR
@@ -242,7 +244,8 @@ MONTH_OF_YEAR    |SCALAR
 NOW              |SCALAR
 QUARTER          |SCALAR         
 SECOND           |SCALAR         
-SECOND_OF_MINUTE |SCALAR         
+SECOND_OF_MINUTE |SCALAR
+TODAY            |SCALAR
 WEEK             |SCALAR         
 WEEK_OF_YEAR     |SCALAR         
 YEAR             |SCALAR         
@@ -365,6 +368,7 @@ HOUR_OF_DAY    |SCALAR
 ISODAYOFWEEK   |SCALAR
 ISO_DAY_OF_WEEK|SCALAR
 MINUTE_OF_DAY  |SCALAR         
+TODAY          |SCALAR
 
 // end::showFunctionsWithPattern
 ;
@@ -2227,18 +2231,50 @@ SELECT WEEK(CAST('1988-01-05T09:22:10Z' AS TIMESTAMP)) AS week, ISOWEEK(CAST('19
 ;
 
 
-currentNow
-// tag::filterNow
-SELECT first_name FROM emp WHERE hire_date > NOW() - INTERVAL 100 YEARS ORDER BY first_name ASC LIMIT 5;
 
-  first_name   
----------------
-Alejandro      
-Amabile        
-Anneke         
-Anoosh         
-Arumugam       
-// end::filterNow
+
+currentDate-Ignore
+// tag::curDate
+SELECT CURRENT_TIMESTAMP AS result;
+
+         result
+------------------------
+2018-12-12
+// end::curDate
+;
+
+currentDateFunction-Ignore
+// tag::curDateFunction
+SELECT CURRENT_TIMESTAMP() AS result;
+
+         result
+------------------------
+2018-12-12
+// end::curDateFunction
+;
+
+todayFunction-Ignore
+// tag::todayFunction
+SELECT TODAY() AS result;
+
+         result
+------------------------
+2018-12-12
+// end::todayFunction
+;
+
+filterToday
+// tag::filterToday
+SELECT first_name FROM emp WHERE hire_date > TODAY() - INTERVAL 25 YEARS ORDER BY first_name ASC LIMIT 5;
+
+ first_name
+------------
+Kazuhito
+Kenroku
+Lillian
+Mayumi
+Mingsen
+// end::filterToday
 ;
 
 currentTimestamp-Ignore
@@ -2282,6 +2318,20 @@ SELECT NOW() AS result;
 // end::nowFunction
 ;
 
+filterNow
+// tag::filterNow
+SELECT first_name FROM emp WHERE hire_date > NOW() - INTERVAL 100 YEARS ORDER BY first_name ASC LIMIT 5;
+
+  first_name
+---------------
+Alejandro
+Amabile
+Anneke
+Anoosh
+Arumugam
+// end::filterNow
+;
+
 ////////////
 // Next two queries need to have the same output, as they should be equivalent.
 // They are used in the "SQL Limitations" page.

x-pack/plugin/sql/src/main/antlr/SqlBase.g4

@@ -236,7 +236,8 @@ castTemplate
     ;
 
 builtinDateTimeFunction
-    : name=CURRENT_TIMESTAMP ('(' precision=INTEGER_VALUE? ')')?
+    : name=CURRENT_DATE ('(' ')')?
+    | name=CURRENT_TIMESTAMP ('(' precision=INTEGER_VALUE? ')')?
     ;
     
 convertTemplate
@@ -337,7 +338,7 @@ string
 // http://developer.mimer.se/validator/sql-reserved-words.tml
 nonReserved
     : ANALYZE | ANALYZED 
-    | CATALOGS | COLUMNS | CURRENT 
+    | CATALOGS | COLUMNS
     | DAY | DEBUG  
     | EXECUTABLE | EXPLAIN 
     | FIRST | FORMAT | FULL | FUNCTIONS
@@ -370,7 +371,7 @@ CATALOG: 'CATALOG';
 CATALOGS: 'CATALOGS';
 COLUMNS: 'COLUMNS';
 CONVERT: 'CONVERT';
-CURRENT: 'CURRENT';
+CURRENT_DATE : 'CURRENT_DATE';
 CURRENT_TIMESTAMP : 'CURRENT_TIMESTAMP';
 DAY: 'DAY';
 DAYS: 'DAYS';

x-pack/plugin/sql/src/main/antlr/SqlBase.tokens

@@ -16,7 +16,7 @@ CATALOG=15
 CATALOGS=16
 COLUMNS=17
 CONVERT=18
-CURRENT=19
+CURRENT_DATE=19
 CURRENT_TIMESTAMP=20
 DAY=21
 DAYS=22
@@ -143,7 +143,7 @@ DELIMITER=127
 'CATALOGS'=16
 'COLUMNS'=17
 'CONVERT'=18
-'CURRENT'=19
+'CURRENT_DATE'=19
 'CURRENT_TIMESTAMP'=20
 'DAY'=21
 'DAYS'=22

x-pack/plugin/sql/src/main/antlr/SqlBaseLexer.tokens

@@ -16,7 +16,7 @@ CATALOG=15
 CATALOGS=16
 COLUMNS=17
 CONVERT=18
-CURRENT=19
+CURRENT_DATE=19
 CURRENT_TIMESTAMP=20
 DAY=21
 DAYS=22
@@ -142,7 +142,7 @@ UNRECOGNIZED=126
 'CATALOGS'=16
 'COLUMNS'=17
 'CONVERT'=18
-'CURRENT'=19
+'CURRENT_DATE'=19
 'CURRENT_TIMESTAMP'=20
 'DAY'=21
 'DAYS'=22

x-pack/plugin/sql/src/main/java/org/elasticsearch/xpack/sql/expression/function/FunctionRegistry.java

@@ -27,6 +27,7 @@ import org.elasticsearch.xpack.sql.expression.function.grouping.Histogram;
 import org.elasticsearch.xpack.sql.expression.function.scalar.Cast;
 import org.elasticsearch.xpack.sql.expression.function.scalar.Database;
 import org.elasticsearch.xpack.sql.expression.function.scalar.User;
+import org.elasticsearch.xpack.sql.expression.function.scalar.datetime.CurrentDate;
 import org.elasticsearch.xpack.sql.expression.function.scalar.datetime.CurrentDateTime;
 import org.elasticsearch.xpack.sql.expression.function.scalar.datetime.DayName;
 import org.elasticsearch.xpack.sql.expression.function.scalar.datetime.DayOfMonth;
@@ -169,7 +170,8 @@ public class FunctionRegistry {
                 def(Greatest.class, Greatest::new, "GREATEST"),
                 def(Least.class, Least::new, "LEAST"));
         // Date
-        addToMap(def(CurrentDateTime.class, CurrentDateTime::new, "CURRENT_TIMESTAMP", "NOW"),
+        addToMap(def(CurrentDate.class, CurrentDate::new, "CURRENT_DATE", "CURDATE", "TODAY"),
+                def(CurrentDateTime.class, CurrentDateTime::new, "CURRENT_TIMESTAMP", "NOW"),
                 def(DayName.class, DayName::new, "DAY_NAME", "DAYNAME"),
                 def(DayOfMonth.class, DayOfMonth::new, "DAY_OF_MONTH", "DAYOFMONTH", "DAY", "DOM"),
                 def(DayOfWeek.class, DayOfWeek::new, "DAY_OF_WEEK", "DAYOFWEEK", "DOW"),

x-pack/plugin/sql/src/main/java/org/elasticsearch/xpack/sql/expression/function/scalar/ConfigurationFunction.java

@@ -32,7 +32,7 @@ public abstract class ConfigurationFunction extends ScalarFunction {
         throw new UnsupportedOperationException("this node doesn't have any children");
     }
 
-    protected Configuration configuration() {
+    public Configuration configuration() {
         return configuration;
     }
 

x-pack/plugin/sql/src/main/java/org/elasticsearch/xpack/sql/expression/function/scalar/datetime/CurrentDate.java

@@ -0,0 +1,25 @@
+/*
+ * Copyright Elasticsearch B.V. and/or licensed to Elasticsearch B.V. under one
+ * or more contributor license agreements. Licensed under the Elastic License;
+ * you may not use this file except in compliance with the Elastic License.
+ */
+
+package org.elasticsearch.xpack.sql.expression.function.scalar.datetime;
+
+import org.elasticsearch.xpack.sql.session.Configuration;
+import org.elasticsearch.xpack.sql.tree.NodeInfo;
+import org.elasticsearch.xpack.sql.tree.Source;
+import org.elasticsearch.xpack.sql.type.DataType;
+import org.elasticsearch.xpack.sql.util.DateUtils;
+
+public class CurrentDate extends CurrentFunction {
+
+    public CurrentDate(Source source, Configuration configuration) {
+        super(source, configuration, DateUtils.asDateOnly(configuration.now()), DataType.DATE);
+    }
+
+    @Override
+    protected NodeInfo<CurrentDate> info() {
+        return NodeInfo.create(this, CurrentDate::new, configuration());
+    }
+}

x-pack/plugin/sql/src/main/java/org/elasticsearch/xpack/sql/expression/function/scalar/datetime/CurrentDateTime.java

@@ -7,29 +7,25 @@
 package org.elasticsearch.xpack.sql.expression.function.scalar.datetime;
 
 import org.elasticsearch.xpack.sql.expression.Expression;
-import org.elasticsearch.xpack.sql.expression.function.scalar.ConfigurationFunction;
+import org.elasticsearch.xpack.sql.expression.Foldables;
 import org.elasticsearch.xpack.sql.session.Configuration;
-import org.elasticsearch.xpack.sql.tree.Source;
 import org.elasticsearch.xpack.sql.tree.NodeInfo;
+import org.elasticsearch.xpack.sql.tree.Source;
 import org.elasticsearch.xpack.sql.type.DataType;
 
 import java.time.ZonedDateTime;
-import java.util.Objects;
 
-public class CurrentDateTime extends ConfigurationFunction {
+public class CurrentDateTime extends CurrentFunction {
+
     private final Expression precision;
-    private final ZonedDateTime dateTime;
 
     public CurrentDateTime(Source source, Expression precision, Configuration configuration) {
-        super(source, configuration, DataType.DATETIME);
+        super(source, configuration, nanoPrecision(configuration.now(), precision), DataType.DATETIME);
         this.precision = precision;
-        int p = precision != null ? ((Number) precision.fold()).intValue() : 0;
-        this.dateTime = nanoPrecision(configuration().now(), p);
     }
 
-    @Override
-    public Object fold() {
-        return dateTime;
+    Expression precision() {
+        return precision;
     }
 
     @Override
@@ -37,33 +33,13 @@ public class CurrentDateTime extends ConfigurationFunction {
         return NodeInfo.create(this, CurrentDateTime::new, precision, configuration());
     }
 
-    @Override
-    public int hashCode() {
-        return Objects.hash(dateTime);
-    }
-
-    @Override
-    public boolean equals(Object obj) {
-        if (this == obj) {
-            return true;
-        }
-
-        if (obj == null || getClass() != obj.getClass()) {
-            return false;
-        }
-
-        CurrentDateTime other = (CurrentDateTime) obj;
-        return Objects.equals(dateTime, other.dateTime);
-    }
-
-    static ZonedDateTime nanoPrecision(ZonedDateTime zdt, int precision) {
-        if (zdt != null) {
-            int nano = zdt.getNano();
-            if (precision >= 0 && precision < 10) {
-                // remove the remainder
-                nano = nano - nano % (int) Math.pow(10, (9 - precision));
-                return zdt.withNano(nano);
-            }
+    static ZonedDateTime nanoPrecision(ZonedDateTime zdt, Expression precisionExpression) {
+        int precision = precisionExpression != null ? Foldables.intValueOf(precisionExpression) : 0;
+        int nano = zdt.getNano();
+        if (precision >= 0 && precision < 10) {
+            // remove the remainder
+            nano = nano - nano % (int) Math.pow(10, (9 - precision));
+            return zdt.withNano(nano);
         }
         return zdt;
     }

x-pack/plugin/sql/src/main/java/org/elasticsearch/xpack/sql/expression/function/scalar/datetime/CurrentFunction.java

@@ -0,0 +1,49 @@
+/*
+ * Copyright Elasticsearch B.V. and/or licensed to Elasticsearch B.V. under one
+ * or more contributor license agreements. Licensed under the Elastic License;
+ * you may not use this file except in compliance with the Elastic License.
+ */
+
+package org.elasticsearch.xpack.sql.expression.function.scalar.datetime;
+
+import org.elasticsearch.xpack.sql.expression.function.scalar.ConfigurationFunction;
+import org.elasticsearch.xpack.sql.session.Configuration;
+import org.elasticsearch.xpack.sql.tree.Source;
+import org.elasticsearch.xpack.sql.type.DataType;
+
+import java.time.ZonedDateTime;
+import java.util.Objects;
+
+abstract class CurrentFunction extends ConfigurationFunction {
+
+    private final ZonedDateTime date;
+
+    CurrentFunction(Source source, Configuration configuration, ZonedDateTime date, DataType dataType) {
+        super(source, configuration, dataType);
+        this.date = date;
+    }
+
+    @Override
+    public Object fold() {
+        return date;
+    }
+
+    @Override
+    public int hashCode() {
+        return Objects.hash(date);
+    }
+
+    @Override
+    public boolean equals(Object obj) {
+        if (this == obj) {
+            return true;
+        }
+
+        if (obj == null || getClass() != obj.getClass()) {
+            return false;
+        }
+
+        CurrentFunction other = (CurrentFunction) obj;
+        return Objects.equals(date, other.date);
+    }
+}

x-pack/plugin/sql/src/main/java/org/elasticsearch/xpack/sql/parser/ExpressionBuilder.java

@@ -465,7 +465,7 @@ abstract class ExpressionBuilder extends IdentifierBuilder {
 
     @Override
     public Object visitBuiltinDateTimeFunction(BuiltinDateTimeFunctionContext ctx) {
-        // maps current_XXX to their respective functions
+        // maps CURRENT_XXX to its respective function e.g: CURRENT_TIMESTAMP()
         // since the functions need access to the Configuration, the parser only registers the definition and not the actual function
         Source source = source(ctx);
         Literal p = null;
@@ -484,13 +484,15 @@ abstract class ExpressionBuilder extends IdentifierBuilder {
         }
         
         String functionName = ctx.name.getText();
-        
+
         switch (ctx.name.getType()) {
+            case SqlBaseLexer.CURRENT_DATE:
+                return new UnresolvedFunction(source, functionName, ResolutionType.STANDARD, emptyList());
             case SqlBaseLexer.CURRENT_TIMESTAMP:
                 return new UnresolvedFunction(source, functionName, ResolutionType.STANDARD, p != null ? singletonList(p) : emptyList());
+            default:
+                throw new ParsingException(source, "Unknown function [{}]", functionName);
         }
-
-        throw new ParsingException(source, "Unknown function [{}]", functionName);
     }
 
     @Override

x-pack/plugin/sql/src/main/java/org/elasticsearch/xpack/sql/parser/SqlBaseLexer.java

@@ -19,7 +19,7 @@ class SqlBaseLexer extends Lexer {
   public static final int
     T__0=1, T__1=2, T__2=3, T__3=4, ALL=5, ANALYZE=6, ANALYZED=7, AND=8, ANY=9, 
     AS=10, ASC=11, BETWEEN=12, BY=13, CAST=14, CATALOG=15, CATALOGS=16, COLUMNS=17, 
-    CONVERT=18, CURRENT=19, CURRENT_TIMESTAMP=20, DAY=21, DAYS=22, DEBUG=23, 
+    CONVERT=18, CURRENT_DATE=19, CURRENT_TIMESTAMP=20, DAY=21, DAYS=22, DEBUG=23, 
     DESC=24, DESCRIBE=25, DISTINCT=26, ESCAPE=27, EXECUTABLE=28, EXISTS=29, 
     EXPLAIN=30, EXTRACT=31, FALSE=32, FIRST=33, FORMAT=34, FROM=35, FULL=36, 
     FUNCTIONS=37, GRAPHVIZ=38, GROUP=39, HAVING=40, HOUR=41, HOURS=42, IN=43, 
@@ -43,16 +43,16 @@ class SqlBaseLexer extends Lexer {
   public static final String[] ruleNames = {
     "T__0", "T__1", "T__2", "T__3", "ALL", "ANALYZE", "ANALYZED", "AND", "ANY", 
     "AS", "ASC", "BETWEEN", "BY", "CAST", "CATALOG", "CATALOGS", "COLUMNS", 
-    "CONVERT", "CURRENT", "CURRENT_TIMESTAMP", "DAY", "DAYS", "DEBUG", "DESC", 
-    "DESCRIBE", "DISTINCT", "ESCAPE", "EXECUTABLE", "EXISTS", "EXPLAIN", "EXTRACT", 
-    "FALSE", "FIRST", "FORMAT", "FROM", "FULL", "FUNCTIONS", "GRAPHVIZ", "GROUP", 
-    "HAVING", "HOUR", "HOURS", "IN", "INNER", "INTERVAL", "IS", "JOIN", "LAST", 
-    "LEFT", "LIKE", "LIMIT", "MAPPED", "MATCH", "MINUTE", "MINUTES", "MONTH", 
-    "MONTHS", "NATURAL", "NOT", "NULL", "NULLS", "ON", "OPTIMIZED", "OR", 
-    "ORDER", "OUTER", "PARSED", "PHYSICAL", "PLAN", "RIGHT", "RLIKE", "QUERY", 
-    "SCHEMAS", "SECOND", "SECONDS", "SELECT", "SHOW", "SYS", "TABLE", "TABLES", 
-    "TEXT", "TRUE", "TO", "TYPE", "TYPES", "USING", "VERIFY", "WHERE", "WITH", 
-    "YEAR", "YEARS", "ESCAPE_ESC", "FUNCTION_ESC", "LIMIT_ESC", "DATE_ESC", 
+    "CONVERT", "CURRENT_DATE", "CURRENT_TIMESTAMP", "DAY", "DAYS", "DEBUG", 
+    "DESC", "DESCRIBE", "DISTINCT", "ESCAPE", "EXECUTABLE", "EXISTS", "EXPLAIN", 
+    "EXTRACT", "FALSE", "FIRST", "FORMAT", "FROM", "FULL", "FUNCTIONS", "GRAPHVIZ", 
+    "GROUP", "HAVING", "HOUR", "HOURS", "IN", "INNER", "INTERVAL", "IS", "JOIN", 
+    "LAST", "LEFT", "LIKE", "LIMIT", "MAPPED", "MATCH", "MINUTE", "MINUTES", 
+    "MONTH", "MONTHS", "NATURAL", "NOT", "NULL", "NULLS", "ON", "OPTIMIZED", 
+    "OR", "ORDER", "OUTER", "PARSED", "PHYSICAL", "PLAN", "RIGHT", "RLIKE", 
+    "QUERY", "SCHEMAS", "SECOND", "SECONDS", "SELECT", "SHOW", "SYS", "TABLE", 
+    "TABLES", "TEXT", "TRUE", "TO", "TYPE", "TYPES", "USING", "VERIFY", "WHERE", 
+    "WITH", "YEAR", "YEARS", "ESCAPE_ESC", "FUNCTION_ESC", "LIMIT_ESC", "DATE_ESC", 
     "TIME_ESC", "TIMESTAMP_ESC", "GUID_ESC", "ESC_END", "EQ", "NULLEQ", "NEQ", 
     "LT", "LTE", "GT", "GTE", "PLUS", "MINUS", "ASTERISK", "SLASH", "PERCENT", 
     "CONCAT", "DOT", "PARAM", "STRING", "INTEGER_VALUE", "DECIMAL_VALUE", 
@@ -64,7 +64,7 @@ class SqlBaseLexer extends Lexer {
   private static final String[] _LITERAL_NAMES = {
     null, "'('", "')'", "','", "':'", "'ALL'", "'ANALYZE'", "'ANALYZED'", 
     "'AND'", "'ANY'", "'AS'", "'ASC'", "'BETWEEN'", "'BY'", "'CAST'", "'CATALOG'", 
-    "'CATALOGS'", "'COLUMNS'", "'CONVERT'", "'CURRENT'", "'CURRENT_TIMESTAMP'", 
+    "'CATALOGS'", "'COLUMNS'", "'CONVERT'", "'CURRENT_DATE'", "'CURRENT_TIMESTAMP'", 
     "'DAY'", "'DAYS'", "'DEBUG'", "'DESC'", "'DESCRIBE'", "'DISTINCT'", "'ESCAPE'", 
     "'EXECUTABLE'", "'EXISTS'", "'EXPLAIN'", "'EXTRACT'", "'FALSE'", "'FIRST'", 
     "'FORMAT'", "'FROM'", "'FULL'", "'FUNCTIONS'", "'GRAPHVIZ'", "'GROUP'", 
@@ -83,16 +83,16 @@ class SqlBaseLexer extends Lexer {
   private static final String[] _SYMBOLIC_NAMES = {
     null, null, null, null, null, "ALL", "ANALYZE", "ANALYZED", "AND", "ANY", 
     "AS", "ASC", "BETWEEN", "BY", "CAST", "CATALOG", "CATALOGS", "COLUMNS", 
-    "CONVERT", "CURRENT", "CURRENT_TIMESTAMP", "DAY", "DAYS", "DEBUG", "DESC", 
-    "DESCRIBE", "DISTINCT", "ESCAPE", "EXECUTABLE", "EXISTS", "EXPLAIN", "EXTRACT", 
-    "FALSE", "FIRST", "FORMAT", "FROM", "FULL", "FUNCTIONS", "GRAPHVIZ", "GROUP", 
-    "HAVING", "HOUR", "HOURS", "IN", "INNER", "INTERVAL", "IS", "JOIN", "LAST", 
-    "LEFT", "LIKE", "LIMIT", "MAPPED", "MATCH", "MINUTE", "MINUTES", "MONTH", 
-    "MONTHS", "NATURAL", "NOT", "NULL", "NULLS", "ON", "OPTIMIZED", "OR", 
-    "ORDER", "OUTER", "PARSED", "PHYSICAL", "PLAN", "RIGHT", "RLIKE", "QUERY", 
-    "SCHEMAS", "SECOND", "SECONDS", "SELECT", "SHOW", "SYS", "TABLE", "TABLES", 
-    "TEXT", "TRUE", "TO", "TYPE", "TYPES", "USING", "VERIFY", "WHERE", "WITH", 
-    "YEAR", "YEARS", "ESCAPE_ESC", "FUNCTION_ESC", "LIMIT_ESC", "DATE_ESC", 
+    "CONVERT", "CURRENT_DATE", "CURRENT_TIMESTAMP", "DAY", "DAYS", "DEBUG", 
+    "DESC", "DESCRIBE", "DISTINCT", "ESCAPE", "EXECUTABLE", "EXISTS", "EXPLAIN", 
+    "EXTRACT", "FALSE", "FIRST", "FORMAT", "FROM", "FULL", "FUNCTIONS", "GRAPHVIZ", 
+    "GROUP", "HAVING", "HOUR", "HOURS", "IN", "INNER", "INTERVAL", "IS", "JOIN", 
+    "LAST", "LEFT", "LIKE", "LIMIT", "MAPPED", "MATCH", "MINUTE", "MINUTES", 
+    "MONTH", "MONTHS", "NATURAL", "NOT", "NULL", "NULLS", "ON", "OPTIMIZED", 
+    "OR", "ORDER", "OUTER", "PARSED", "PHYSICAL", "PLAN", "RIGHT", "RLIKE", 
+    "QUERY", "SCHEMAS", "SECOND", "SECONDS", "SELECT", "SHOW", "SYS", "TABLE", 
+    "TABLES", "TEXT", "TRUE", "TO", "TYPE", "TYPES", "USING", "VERIFY", "WHERE", 
+    "WITH", "YEAR", "YEARS", "ESCAPE_ESC", "FUNCTION_ESC", "LIMIT_ESC", "DATE_ESC", 
     "TIME_ESC", "TIMESTAMP_ESC", "GUID_ESC", "ESC_END", "EQ", "NULLEQ", "NEQ", 
     "LT", "LTE", "GT", "GTE", "PLUS", "MINUS", "ASTERISK", "SLASH", "PERCENT", 
     "CONCAT", "DOT", "PARAM", "STRING", "INTEGER_VALUE", "DECIMAL_VALUE", 
@@ -155,7 +155,7 @@ class SqlBaseLexer extends Lexer {
   public ATN getATN() { return _ATN; }
 
   public static final String _serializedATN =
-    "\3\u0430\ud6d1\u8206\uad2d\u4417\uaef1\u8d80\uaadd\2\u0080\u0423\b\1\4"+
+    "\3\u0430\ud6d1\u8206\uad2d\u4417\uaef1\u8d80\uaadd\2\u0080\u0428\b\1\4"+
     "\2\t\2\4\3\t\3\4\4\t\4\4\5\t\5\4\6\t\6\4\7\t\7\4\b\t\b\4\t\t\t\4\n\t\n"+
     "\4\13\t\13\4\f\t\f\4\r\t\r\4\16\t\16\4\17\t\17\4\20\t\20\4\21\t\21\4\22"+
     "\t\22\4\23\t\23\4\24\t\24\4\25\t\25\4\26\t\26\4\27\t\27\4\30\t\30\4\31"+
@@ -176,345 +176,346 @@ class SqlBaseLexer extends Lexer {
     "\3\17\3\17\3\20\3\20\3\20\3\20\3\20\3\20\3\20\3\20\3\21\3\21\3\21\3\21"+
     "\3\21\3\21\3\21\3\21\3\21\3\22\3\22\3\22\3\22\3\22\3\22\3\22\3\22\3\23"+
     "\3\23\3\23\3\23\3\23\3\23\3\23\3\23\3\24\3\24\3\24\3\24\3\24\3\24\3\24"+
-    "\3\24\3\25\3\25\3\25\3\25\3\25\3\25\3\25\3\25\3\25\3\25\3\25\3\25\3\25"+
-    "\3\25\3\25\3\25\3\25\3\25\3\26\3\26\3\26\3\26\3\27\3\27\3\27\3\27\3\27"+
-    "\3\30\3\30\3\30\3\30\3\30\3\30\3\31\3\31\3\31\3\31\3\31\3\32\3\32\3\32"+
-    "\3\32\3\32\3\32\3\32\3\32\3\32\3\33\3\33\3\33\3\33\3\33\3\33\3\33\3\33"+
-    "\3\33\3\34\3\34\3\34\3\34\3\34\3\34\3\34\3\35\3\35\3\35\3\35\3\35\3\35"+
-    "\3\35\3\35\3\35\3\35\3\35\3\36\3\36\3\36\3\36\3\36\3\36\3\36\3\37\3\37"+
-    "\3\37\3\37\3\37\3\37\3\37\3\37\3 \3 \3 \3 \3 \3 \3 \3 \3!\3!\3!\3!\3!"+
-    "\3!\3\"\3\"\3\"\3\"\3\"\3\"\3#\3#\3#\3#\3#\3#\3#\3$\3$\3$\3$\3$\3%\3%"+
-    "\3%\3%\3%\3&\3&\3&\3&\3&\3&\3&\3&\3&\3&\3\'\3\'\3\'\3\'\3\'\3\'\3\'\3"+
-    "\'\3\'\3(\3(\3(\3(\3(\3(\3)\3)\3)\3)\3)\3)\3)\3*\3*\3*\3*\3*\3+\3+\3+"+
-    "\3+\3+\3+\3,\3,\3,\3-\3-\3-\3-\3-\3-\3.\3.\3.\3.\3.\3.\3.\3.\3.\3/\3/"+
-    "\3/\3\60\3\60\3\60\3\60\3\60\3\61\3\61\3\61\3\61\3\61\3\62\3\62\3\62\3"+
-    "\62\3\62\3\63\3\63\3\63\3\63\3\63\3\64\3\64\3\64\3\64\3\64\3\64\3\65\3"+
-    "\65\3\65\3\65\3\65\3\65\3\65\3\66\3\66\3\66\3\66\3\66\3\66\3\67\3\67\3"+
-    "\67\3\67\3\67\3\67\3\67\38\38\38\38\38\38\38\38\39\39\39\39\39\39\3:\3"+
-    ":\3:\3:\3:\3:\3:\3;\3;\3;\3;\3;\3;\3;\3;\3<\3<\3<\3<\3=\3=\3=\3=\3=\3"+
-    ">\3>\3>\3>\3>\3>\3?\3?\3?\3@\3@\3@\3@\3@\3@\3@\3@\3@\3@\3A\3A\3A\3B\3"+
-    "B\3B\3B\3B\3B\3C\3C\3C\3C\3C\3C\3D\3D\3D\3D\3D\3D\3D\3E\3E\3E\3E\3E\3"+
-    "E\3E\3E\3E\3F\3F\3F\3F\3F\3G\3G\3G\3G\3G\3G\3H\3H\3H\3H\3H\3H\3I\3I\3"+
-    "I\3I\3I\3I\3J\3J\3J\3J\3J\3J\3J\3J\3K\3K\3K\3K\3K\3K\3K\3L\3L\3L\3L\3"+
-    "L\3L\3L\3L\3M\3M\3M\3M\3M\3M\3M\3N\3N\3N\3N\3N\3O\3O\3O\3O\3P\3P\3P\3"+
-    "P\3P\3P\3Q\3Q\3Q\3Q\3Q\3Q\3Q\3R\3R\3R\3R\3R\3S\3S\3S\3S\3S\3T\3T\3T\3"+
-    "U\3U\3U\3U\3U\3V\3V\3V\3V\3V\3V\3W\3W\3W\3W\3W\3W\3X\3X\3X\3X\3X\3X\3"+
-    "X\3Y\3Y\3Y\3Y\3Y\3Y\3Z\3Z\3Z\3Z\3Z\3[\3[\3[\3[\3[\3\\\3\\\3\\\3\\\3\\"+
-    "\3\\\3]\3]\3]\3]\3]\3]\3]\3]\3^\3^\3^\3^\3_\3_\3_\3_\3_\3_\3_\3`\3`\3"+
-    "`\3a\3a\3a\3b\3b\3b\3b\3c\3c\3c\3c\3c\3c\3d\3d\3e\3e\3f\3f\3f\3f\3g\3"+
-    "g\3g\3g\5g\u0364\ng\3h\3h\3i\3i\3i\3j\3j\3k\3k\3k\3l\3l\3m\3m\3n\3n\3"+
-    "o\3o\3p\3p\3q\3q\3q\3r\3r\3s\3s\3t\3t\3t\3t\7t\u0385\nt\ft\16t\u0388\13"+
-    "t\3t\3t\3u\6u\u038d\nu\ru\16u\u038e\3v\6v\u0392\nv\rv\16v\u0393\3v\3v"+
-    "\7v\u0398\nv\fv\16v\u039b\13v\3v\3v\6v\u039f\nv\rv\16v\u03a0\3v\6v\u03a4"+
-    "\nv\rv\16v\u03a5\3v\3v\7v\u03aa\nv\fv\16v\u03ad\13v\5v\u03af\nv\3v\3v"+
-    "\3v\3v\6v\u03b5\nv\rv\16v\u03b6\3v\3v\5v\u03bb\nv\3w\3w\5w\u03bf\nw\3"+
-    "w\3w\3w\7w\u03c4\nw\fw\16w\u03c7\13w\3x\3x\3x\3x\6x\u03cd\nx\rx\16x\u03ce"+
-    "\3y\3y\3y\6y\u03d4\ny\ry\16y\u03d5\3z\3z\3z\3z\7z\u03dc\nz\fz\16z\u03df"+
-    "\13z\3z\3z\3{\3{\3{\3{\7{\u03e7\n{\f{\16{\u03ea\13{\3{\3{\3|\3|\5|\u03f0"+
-    "\n|\3|\6|\u03f3\n|\r|\16|\u03f4\3}\3}\3~\3~\3\177\3\177\3\177\3\177\7"+
-    "\177\u03ff\n\177\f\177\16\177\u0402\13\177\3\177\5\177\u0405\n\177\3\177"+
-    "\5\177\u0408\n\177\3\177\3\177\3\u0080\3\u0080\3\u0080\3\u0080\3\u0080"+
-    "\7\u0080\u0411\n\u0080\f\u0080\16\u0080\u0414\13\u0080\3\u0080\3\u0080"+
-    "\3\u0080\3\u0080\3\u0080\3\u0081\6\u0081\u041c\n\u0081\r\u0081\16\u0081"+
-    "\u041d\3\u0081\3\u0081\3\u0082\3\u0082\3\u0412\2\u0083\3\3\5\4\7\5\t\6"+
-    "\13\7\r\b\17\t\21\n\23\13\25\f\27\r\31\16\33\17\35\20\37\21!\22#\23%\24"+
-    "\'\25)\26+\27-\30/\31\61\32\63\33\65\34\67\359\36;\37= ?!A\"C#E$G%I&K"+
-    "\'M(O)Q*S+U,W-Y.[/]\60_\61a\62c\63e\64g\65i\66k\67m8o9q:s;u<w=y>{?}@\177"+
-    "A\u0081B\u0083C\u0085D\u0087E\u0089F\u008bG\u008dH\u008fI\u0091J\u0093"+
-    "K\u0095L\u0097M\u0099N\u009bO\u009dP\u009fQ\u00a1R\u00a3S\u00a5T\u00a7"+
-    "U\u00a9V\u00abW\u00adX\u00afY\u00b1Z\u00b3[\u00b5\\\u00b7]\u00b9^\u00bb"+
-    "_\u00bd`\u00bfa\u00c1b\u00c3c\u00c5d\u00c7e\u00c9f\u00cbg\u00cdh\u00cf"+
-    "i\u00d1j\u00d3k\u00d5l\u00d7m\u00d9n\u00dbo\u00ddp\u00dfq\u00e1r\u00e3"+
-    "s\u00e5t\u00e7u\u00e9v\u00ebw\u00edx\u00efy\u00f1z\u00f3{\u00f5|\u00f7"+
-    "\2\u00f9\2\u00fb\2\u00fd}\u00ff~\u0101\177\u0103\u0080\3\2\f\3\2))\4\2"+
-    "BBaa\5\2<<BBaa\3\2$$\3\2bb\4\2--//\3\2\62;\3\2C\\\4\2\f\f\17\17\5\2\13"+
-    "\f\17\17\"\"\u0443\2\3\3\2\2\2\2\5\3\2\2\2\2\7\3\2\2\2\2\t\3\2\2\2\2\13"+
-    "\3\2\2\2\2\r\3\2\2\2\2\17\3\2\2\2\2\21\3\2\2\2\2\23\3\2\2\2\2\25\3\2\2"+
-    "\2\2\27\3\2\2\2\2\31\3\2\2\2\2\33\3\2\2\2\2\35\3\2\2\2\2\37\3\2\2\2\2"+
-    "!\3\2\2\2\2#\3\2\2\2\2%\3\2\2\2\2\'\3\2\2\2\2)\3\2\2\2\2+\3\2\2\2\2-\3"+
-    "\2\2\2\2/\3\2\2\2\2\61\3\2\2\2\2\63\3\2\2\2\2\65\3\2\2\2\2\67\3\2\2\2"+
-    "\29\3\2\2\2\2;\3\2\2\2\2=\3\2\2\2\2?\3\2\2\2\2A\3\2\2\2\2C\3\2\2\2\2E"+
-    "\3\2\2\2\2G\3\2\2\2\2I\3\2\2\2\2K\3\2\2\2\2M\3\2\2\2\2O\3\2\2\2\2Q\3\2"+
-    "\2\2\2S\3\2\2\2\2U\3\2\2\2\2W\3\2\2\2\2Y\3\2\2\2\2[\3\2\2\2\2]\3\2\2\2"+
-    "\2_\3\2\2\2\2a\3\2\2\2\2c\3\2\2\2\2e\3\2\2\2\2g\3\2\2\2\2i\3\2\2\2\2k"+
-    "\3\2\2\2\2m\3\2\2\2\2o\3\2\2\2\2q\3\2\2\2\2s\3\2\2\2\2u\3\2\2\2\2w\3\2"+
-    "\2\2\2y\3\2\2\2\2{\3\2\2\2\2}\3\2\2\2\2\177\3\2\2\2\2\u0081\3\2\2\2\2"+
-    "\u0083\3\2\2\2\2\u0085\3\2\2\2\2\u0087\3\2\2\2\2\u0089\3\2\2\2\2\u008b"+
-    "\3\2\2\2\2\u008d\3\2\2\2\2\u008f\3\2\2\2\2\u0091\3\2\2\2\2\u0093\3\2\2"+
-    "\2\2\u0095\3\2\2\2\2\u0097\3\2\2\2\2\u0099\3\2\2\2\2\u009b\3\2\2\2\2\u009d"+
-    "\3\2\2\2\2\u009f\3\2\2\2\2\u00a1\3\2\2\2\2\u00a3\3\2\2\2\2\u00a5\3\2\2"+
-    "\2\2\u00a7\3\2\2\2\2\u00a9\3\2\2\2\2\u00ab\3\2\2\2\2\u00ad\3\2\2\2\2\u00af"+
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-    "\2\2\u00b9\3\2\2\2\2\u00bb\3\2\2\2\2\u00bd\3\2\2\2\2\u00bf\3\2\2\2\2\u00c1"+
-    "\3\2\2\2\2\u00c3\3\2\2\2\2\u00c5\3\2\2\2\2\u00c7\3\2\2\2\2\u00c9\3\2\2"+
-    "\2\2\u00cb\3\2\2\2\2\u00cd\3\2\2\2\2\u00cf\3\2\2\2\2\u00d1\3\2\2\2\2\u00d3"+
-    "\3\2\2\2\2\u00d5\3\2\2\2\2\u00d7\3\2\2\2\2\u00d9\3\2\2\2\2\u00db\3\2\2"+
-    "\2\2\u00dd\3\2\2\2\2\u00df\3\2\2\2\2\u00e1\3\2\2\2\2\u00e3\3\2\2\2\2\u00e5"+
-    "\3\2\2\2\2\u00e7\3\2\2\2\2\u00e9\3\2\2\2\2\u00eb\3\2\2\2\2\u00ed\3\2\2"+
-    "\2\2\u00ef\3\2\2\2\2\u00f1\3\2\2\2\2\u00f3\3\2\2\2\2\u00f5\3\2\2\2\2\u00fd"+
-    "\3\2\2\2\2\u00ff\3\2\2\2\2\u0101\3\2\2\2\2\u0103\3\2\2\2\3\u0105\3\2\2"+
-    "\2\5\u0107\3\2\2\2\7\u0109\3\2\2\2\t\u010b\3\2\2\2\13\u010d\3\2\2\2\r"+
-    "\u0111\3\2\2\2\17\u0119\3\2\2\2\21\u0122\3\2\2\2\23\u0126\3\2\2\2\25\u012a"+
-    "\3\2\2\2\27\u012d\3\2\2\2\31\u0131\3\2\2\2\33\u0139\3\2\2\2\35\u013c\3"+
-    "\2\2\2\37\u0141\3\2\2\2!\u0149\3\2\2\2#\u0152\3\2\2\2%\u015a\3\2\2\2\'"+
-    "\u0162\3\2\2\2)\u016a\3\2\2\2+\u017c\3\2\2\2-\u0180\3\2\2\2/\u0185\3\2"+
-    "\2\2\61\u018b\3\2\2\2\63\u0190\3\2\2\2\65\u0199\3\2\2\2\67\u01a2\3\2\2"+
-    "\29\u01a9\3\2\2\2;\u01b4\3\2\2\2=\u01bb\3\2\2\2?\u01c3\3\2\2\2A\u01cb"+
-    "\3\2\2\2C\u01d1\3\2\2\2E\u01d7\3\2\2\2G\u01de\3\2\2\2I\u01e3\3\2\2\2K"+
-    "\u01e8\3\2\2\2M\u01f2\3\2\2\2O\u01fb\3\2\2\2Q\u0201\3\2\2\2S\u0208\3\2"+
-    "\2\2U\u020d\3\2\2\2W\u0213\3\2\2\2Y\u0216\3\2\2\2[\u021c\3\2\2\2]\u0225"+
-    "\3\2\2\2_\u0228\3\2\2\2a\u022d\3\2\2\2c\u0232\3\2\2\2e\u0237\3\2\2\2g"+
-    "\u023c\3\2\2\2i\u0242\3\2\2\2k\u0249\3\2\2\2m\u024f\3\2\2\2o\u0256\3\2"+
-    "\2\2q\u025e\3\2\2\2s\u0264\3\2\2\2u\u026b\3\2\2\2w\u0273\3\2\2\2y\u0277"+
-    "\3\2\2\2{\u027c\3\2\2\2}\u0282\3\2\2\2\177\u0285\3\2\2\2\u0081\u028f\3"+
-    "\2\2\2\u0083\u0292\3\2\2\2\u0085\u0298\3\2\2\2\u0087\u029e\3\2\2\2\u0089"+
-    "\u02a5\3\2\2\2\u008b\u02ae\3\2\2\2\u008d\u02b3\3\2\2\2\u008f\u02b9\3\2"+
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-    "}\2\u03f2\u03f1\3\2\2\2\u03f3\u03f4\3\2\2\2\u03f4\u03f2\3\2\2\2\u03f4"+
-    "\u03f5\3\2\2\2\u03f5\u00f8\3\2\2\2\u03f6\u03f7\t\b\2\2\u03f7\u00fa\3\2"+
-    "\2\2\u03f8\u03f9\t\t\2\2\u03f9\u00fc\3\2\2\2\u03fa\u03fb\7/\2\2\u03fb"+
-    "\u03fc\7/\2\2\u03fc\u0400\3\2\2\2\u03fd\u03ff\n\n\2\2\u03fe\u03fd\3\2"+
-    "\2\2\u03ff\u0402\3\2\2\2\u0400\u03fe\3\2\2\2\u0400\u0401\3\2\2\2\u0401"+
-    "\u0404\3\2\2\2\u0402\u0400\3\2\2\2\u0403\u0405\7\17\2\2\u0404\u0403\3"+
-    "\2\2\2\u0404\u0405\3\2\2\2\u0405\u0407\3\2\2\2\u0406\u0408\7\f\2\2\u0407"+
-    "\u0406\3\2\2\2\u0407\u0408\3\2\2\2\u0408\u0409\3\2\2\2\u0409\u040a\b\177"+
-    "\2\2\u040a\u00fe\3\2\2\2\u040b\u040c\7\61\2\2\u040c\u040d\7,\2\2\u040d"+
-    "\u0412\3\2\2\2\u040e\u0411\5\u00ff\u0080\2\u040f\u0411\13\2\2\2\u0410"+
-    "\u040e\3\2\2\2\u0410\u040f\3\2\2\2\u0411\u0414\3\2\2\2\u0412\u0413\3\2"+
-    "\2\2\u0412\u0410\3\2\2\2\u0413\u0415\3\2\2\2\u0414\u0412\3\2\2\2\u0415"+
-    "\u0416\7,\2\2\u0416\u0417\7\61\2\2\u0417\u0418\3\2\2\2\u0418\u0419\b\u0080"+
-    "\2\2\u0419\u0100\3\2\2\2\u041a\u041c\t\13\2\2\u041b\u041a\3\2\2\2\u041c"+
-    "\u041d\3\2\2\2\u041d\u041b\3\2\2\2\u041d\u041e\3\2\2\2\u041e\u041f\3\2"+
-    "\2\2\u041f\u0420\b\u0081\2\2\u0420\u0102\3\2\2\2\u0421\u0422\13\2\2\2"+
-    "\u0422\u0104\3\2\2\2\"\2\u0363\u0384\u0386\u038e\u0393\u0399\u03a0\u03a5"+
-    "\u03ab\u03ae\u03b6\u03ba\u03be\u03c3\u03c5\u03cc\u03ce\u03d3\u03d5\u03db"+
-    "\u03dd\u03e6\u03e8\u03ef\u03f4\u0400\u0404\u0407\u0410\u0412\u041d\3\2"+
-    "\3\2";
+    "\u0394\3\2\2\2\u0394\u00ea\3\2\2\2\u0395\u0397\5\u00f9}\2\u0396\u0395"+
+    "\3\2\2\2\u0397\u0398\3\2\2\2\u0398\u0396\3\2\2\2\u0398\u0399\3\2\2\2\u0399"+
+    "\u039a\3\2\2\2\u039a\u039e\5\u00e3r\2\u039b\u039d\5\u00f9}\2\u039c\u039b"+
+    "\3\2\2\2\u039d\u03a0\3\2\2\2\u039e\u039c\3\2\2\2\u039e\u039f\3\2\2\2\u039f"+
+    "\u03c0\3\2\2\2\u03a0\u039e\3\2\2\2\u03a1\u03a3\5\u00e3r\2\u03a2\u03a4"+
+    "\5\u00f9}\2\u03a3\u03a2\3\2\2\2\u03a4\u03a5\3\2\2\2\u03a5\u03a3\3\2\2"+
+    "\2\u03a5\u03a6\3\2\2\2\u03a6\u03c0\3\2\2\2\u03a7\u03a9\5\u00f9}\2\u03a8"+
+    "\u03a7\3\2\2\2\u03a9\u03aa\3\2\2\2\u03aa\u03a8\3\2\2\2\u03aa\u03ab\3\2"+
+    "\2\2\u03ab\u03b3\3\2\2\2\u03ac\u03b0\5\u00e3r\2\u03ad\u03af\5\u00f9}\2"+
+    "\u03ae\u03ad\3\2\2\2\u03af\u03b2\3\2\2\2\u03b0\u03ae\3\2\2\2\u03b0\u03b1"+
+    "\3\2\2\2\u03b1\u03b4\3\2\2\2\u03b2\u03b0\3\2\2\2\u03b3\u03ac\3\2\2\2\u03b3"+
+    "\u03b4\3\2\2\2\u03b4\u03b5\3\2\2\2\u03b5\u03b6\5\u00f7|\2\u03b6\u03c0"+
+    "\3\2\2\2\u03b7\u03b9\5\u00e3r\2\u03b8\u03ba\5\u00f9}\2\u03b9\u03b8\3\2"+
+    "\2\2\u03ba\u03bb\3\2\2\2\u03bb\u03b9\3\2\2\2\u03bb\u03bc\3\2\2\2\u03bc"+
+    "\u03bd\3\2\2\2\u03bd\u03be\5\u00f7|\2\u03be\u03c0\3\2\2\2\u03bf\u0396"+
+    "\3\2\2\2\u03bf\u03a1\3\2\2\2\u03bf\u03a8\3\2\2\2\u03bf\u03b7\3\2\2\2\u03c0"+
+    "\u00ec\3\2\2\2\u03c1\u03c4\5\u00fb~\2\u03c2\u03c4\7a\2\2\u03c3\u03c1\3"+
+    "\2\2\2\u03c3\u03c2\3\2\2\2\u03c4\u03ca\3\2\2\2\u03c5\u03c9\5\u00fb~\2"+
+    "\u03c6\u03c9\5\u00f9}\2\u03c7\u03c9\t\3\2\2\u03c8\u03c5\3\2\2\2\u03c8"+
+    "\u03c6\3\2\2\2\u03c8\u03c7\3\2\2\2\u03c9\u03cc\3\2\2\2\u03ca\u03c8\3\2"+
+    "\2\2\u03ca\u03cb\3\2\2\2\u03cb\u00ee\3\2\2\2\u03cc\u03ca\3\2\2\2\u03cd"+
+    "\u03d1\5\u00f9}\2\u03ce\u03d2\5\u00fb~\2\u03cf\u03d2\5\u00f9}\2\u03d0"+
+    "\u03d2\t\4\2\2\u03d1\u03ce\3\2\2\2\u03d1\u03cf\3\2\2\2\u03d1\u03d0\3\2"+
+    "\2\2\u03d2\u03d3\3\2\2\2\u03d3\u03d1\3\2\2\2\u03d3\u03d4\3\2\2\2\u03d4"+
+    "\u00f0\3\2\2\2\u03d5\u03d9\5\u00fb~\2\u03d6\u03d9\5\u00f9}\2\u03d7\u03d9"+
+    "\7a\2\2\u03d8\u03d5\3\2\2\2\u03d8\u03d6\3\2\2\2\u03d8\u03d7\3\2\2\2\u03d9"+
+    "\u03da\3\2\2\2\u03da\u03d8\3\2\2\2\u03da\u03db\3\2\2\2\u03db\u00f2\3\2"+
+    "\2\2\u03dc\u03e2\7$\2\2\u03dd\u03e1\n\5\2\2\u03de\u03df\7$\2\2\u03df\u03e1"+
+    "\7$\2\2\u03e0\u03dd\3\2\2\2\u03e0\u03de\3\2\2\2\u03e1\u03e4\3\2\2\2\u03e2"+
+    "\u03e0\3\2\2\2\u03e2\u03e3\3\2\2\2\u03e3\u03e5\3\2\2\2\u03e4\u03e2\3\2"+
+    "\2\2\u03e5\u03e6\7$\2\2\u03e6\u00f4\3\2\2\2\u03e7\u03ed\7b\2\2\u03e8\u03ec"+
+    "\n\6\2\2\u03e9\u03ea\7b\2\2\u03ea\u03ec\7b\2\2\u03eb\u03e8\3\2\2\2\u03eb"+
+    "\u03e9\3\2\2\2\u03ec\u03ef\3\2\2\2\u03ed\u03eb\3\2\2\2\u03ed\u03ee\3\2"+
+    "\2\2\u03ee\u03f0\3\2\2\2\u03ef\u03ed\3\2\2\2\u03f0\u03f1\7b\2\2\u03f1"+
+    "\u00f6\3\2\2\2\u03f2\u03f4\7G\2\2\u03f3\u03f5\t\7\2\2\u03f4\u03f3\3\2"+
+    "\2\2\u03f4\u03f5\3\2\2\2\u03f5\u03f7\3\2\2\2\u03f6\u03f8\5\u00f9}\2\u03f7"+
+    "\u03f6\3\2\2\2\u03f8\u03f9\3\2\2\2\u03f9\u03f7\3\2\2\2\u03f9\u03fa\3\2"+
+    "\2\2\u03fa\u00f8\3\2\2\2\u03fb\u03fc\t\b\2\2\u03fc\u00fa\3\2\2\2\u03fd"+
+    "\u03fe\t\t\2\2\u03fe\u00fc\3\2\2\2\u03ff\u0400\7/\2\2\u0400\u0401\7/\2"+
+    "\2\u0401\u0405\3\2\2\2\u0402\u0404\n\n\2\2\u0403\u0402\3\2\2\2\u0404\u0407"+
+    "\3\2\2\2\u0405\u0403\3\2\2\2\u0405\u0406\3\2\2\2\u0406\u0409\3\2\2\2\u0407"+
+    "\u0405\3\2\2\2\u0408\u040a\7\17\2\2\u0409\u0408\3\2\2\2\u0409\u040a\3"+
+    "\2\2\2\u040a\u040c\3\2\2\2\u040b\u040d\7\f\2\2\u040c\u040b\3\2\2\2\u040c"+
+    "\u040d\3\2\2\2\u040d\u040e\3\2\2\2\u040e\u040f\b\177\2\2\u040f\u00fe\3"+
+    "\2\2\2\u0410\u0411\7\61\2\2\u0411\u0412\7,\2\2\u0412\u0417\3\2\2\2\u0413"+
+    "\u0416\5\u00ff\u0080\2\u0414\u0416\13\2\2\2\u0415\u0413\3\2\2\2\u0415"+
+    "\u0414\3\2\2\2\u0416\u0419\3\2\2\2\u0417\u0418\3\2\2\2\u0417\u0415\3\2"+
+    "\2\2\u0418\u041a\3\2\2\2\u0419\u0417\3\2\2\2\u041a\u041b\7,\2\2\u041b"+
+    "\u041c\7\61\2\2\u041c\u041d\3\2\2\2\u041d\u041e\b\u0080\2\2\u041e\u0100"+
+    "\3\2\2\2\u041f\u0421\t\13\2\2\u0420\u041f\3\2\2\2\u0421\u0422\3\2\2\2"+
+    "\u0422\u0420\3\2\2\2\u0422\u0423\3\2\2\2\u0423\u0424\3\2\2\2\u0424\u0425"+
+    "\b\u0081\2\2\u0425\u0102\3\2\2\2\u0426\u0427\13\2\2\2\u0427\u0104\3\2"+
+    "\2\2\"\2\u0368\u0389\u038b\u0393\u0398\u039e\u03a5\u03aa\u03b0\u03b3\u03bb"+
+    "\u03bf\u03c3\u03c8\u03ca\u03d1\u03d3\u03d8\u03da\u03e0\u03e2\u03eb\u03ed"+
+    "\u03f4\u03f9\u0405\u0409\u040c\u0415\u0417\u0422\3\2\3\2";
   public static final ATN _ATN =
     new ATNDeserializer().deserialize(_serializedATN.toCharArray());
   static {

x-pack/plugin/sql/src/test/java/org/elasticsearch/xpack/sql/expression/function/scalar/datetime/CurrentDateTests.java

@@ -0,0 +1,46 @@
+/*
+ * Copyright Elasticsearch B.V. and/or licensed to Elasticsearch B.V. under one
+ * or more contributor license agreements. Licensed under the Elastic License;
+ * you may not use this file except in compliance with the Elastic License.
+ */
+
+package org.elasticsearch.xpack.sql.expression.function.scalar.datetime;
+
+import org.elasticsearch.xpack.sql.expression.Expression;
+import org.elasticsearch.xpack.sql.proto.Mode;
+import org.elasticsearch.xpack.sql.proto.Protocol;
+import org.elasticsearch.xpack.sql.session.Configuration;
+import org.elasticsearch.xpack.sql.tree.AbstractNodeTestCase;
+import org.elasticsearch.xpack.sql.tree.Source;
+
+public class CurrentDateTests extends AbstractNodeTestCase<CurrentDate, Expression> {
+
+    public static CurrentDate randomCurrentDate() {
+        return new CurrentDate(Source.EMPTY, new Configuration(randomZone(), Protocol.FETCH_SIZE,
+            Protocol.REQUEST_TIMEOUT, Protocol.PAGE_TIMEOUT, null, Mode.PLAIN, null, null, null));
+    }
+
+    @Override
+    protected CurrentDate randomInstance() {
+        return randomCurrentDate();
+    }
+
+    @Override
+    protected CurrentDate copy(CurrentDate instance) {
+        return new CurrentDate(instance.source(), instance.configuration());
+    }
+
+    @Override
+    protected CurrentDate mutate(CurrentDate instance) {
+        return new CurrentDate(instance.source(), new Configuration(randomZone(), Protocol.FETCH_SIZE,
+            Protocol.REQUEST_TIMEOUT, Protocol.PAGE_TIMEOUT, null, Mode.PLAIN, null, null, null));
+    }
+
+    @Override
+    public void testTransform() {
+    }
+
+    @Override
+    public void testReplaceChildren() {
+    }
+}

x-pack/plugin/sql/src/test/java/org/elasticsearch/xpack/sql/expression/function/scalar/datetime/CurrentDateTimeTests.java

@@ -6,23 +6,61 @@
 
 package org.elasticsearch.xpack.sql.expression.function.scalar.datetime;
 
-import org.elasticsearch.test.ESTestCase;
+import org.elasticsearch.xpack.sql.expression.Expression;
+import org.elasticsearch.xpack.sql.expression.Literal;
+import org.elasticsearch.xpack.sql.proto.Mode;
+import org.elasticsearch.xpack.sql.proto.Protocol;
+import org.elasticsearch.xpack.sql.session.Configuration;
+import org.elasticsearch.xpack.sql.tree.AbstractNodeTestCase;
 
 import java.time.ZonedDateTime;
 
-public class CurrentDateTimeTests extends ESTestCase {
+import static org.elasticsearch.xpack.sql.tree.Source.EMPTY;
 
-    public void testNanoPrecision() throws Exception {
+public class CurrentDateTimeTests extends AbstractNodeTestCase<CurrentDateTime, Expression> {
+
+    public static CurrentDateTime randomCurrentDateTime() {
+        return new CurrentDateTime(EMPTY, Literal.of(EMPTY, randomInt(10)),
+            new Configuration(randomZone(), Protocol.FETCH_SIZE,
+                Protocol.REQUEST_TIMEOUT, Protocol.PAGE_TIMEOUT, null, Mode.PLAIN, null, null, null));
+    }
+
+    @Override
+    protected CurrentDateTime randomInstance() {
+        return randomCurrentDateTime();
+    }
+
+    @Override
+    protected CurrentDateTime copy(CurrentDateTime instance) {
+        return new CurrentDateTime(instance.source(), instance.precision(), instance.configuration());
+    }
+
+    @Override
+    protected CurrentDateTime mutate(CurrentDateTime instance) {
+        return new CurrentDateTime(instance.source(), Literal.of(EMPTY, randomInt(10)),
+            new Configuration(randomZone(), Protocol.FETCH_SIZE,
+                Protocol.REQUEST_TIMEOUT, Protocol.PAGE_TIMEOUT, null, Mode.PLAIN, null, null, null));
+    }
+
+    @Override
+    public void testTransform() {
+    }
+
+    @Override
+    public void testReplaceChildren() {
+    }
+
+    public void testNanoPrecision() {
         ZonedDateTime zdt = ZonedDateTime.parse("2018-01-23T12:34:45.123456789Z");
-        assertEquals(000_000_000, CurrentDateTime.nanoPrecision(zdt, 0).getNano());
-        assertEquals(100_000_000, CurrentDateTime.nanoPrecision(zdt, 1).getNano());
-        assertEquals(120_000_000, CurrentDateTime.nanoPrecision(zdt, 2).getNano());
-        assertEquals(123_000_000, CurrentDateTime.nanoPrecision(zdt, 3).getNano());
-        assertEquals(123_400_000, CurrentDateTime.nanoPrecision(zdt, 4).getNano());
-        assertEquals(123_450_000, CurrentDateTime.nanoPrecision(zdt, 5).getNano());
-        assertEquals(123_456_000, CurrentDateTime.nanoPrecision(zdt, 6).getNano());
-        assertEquals(123_456_700, CurrentDateTime.nanoPrecision(zdt, 7).getNano());
-        assertEquals(123_456_780, CurrentDateTime.nanoPrecision(zdt, 8).getNano());
-        assertEquals(123_456_789, CurrentDateTime.nanoPrecision(zdt, 9).getNano());
+        assertEquals(000_000_000, CurrentDateTime.nanoPrecision(zdt, Literal.of(EMPTY, 0)).getNano());
+        assertEquals(100_000_000, CurrentDateTime.nanoPrecision(zdt, Literal.of(EMPTY, 1)).getNano());
+        assertEquals(120_000_000, CurrentDateTime.nanoPrecision(zdt, Literal.of(EMPTY, 2)).getNano());
+        assertEquals(123_000_000, CurrentDateTime.nanoPrecision(zdt, Literal.of(EMPTY, 3)).getNano());
+        assertEquals(123_400_000, CurrentDateTime.nanoPrecision(zdt, Literal.of(EMPTY, 4)).getNano());
+        assertEquals(123_450_000, CurrentDateTime.nanoPrecision(zdt, Literal.of(EMPTY, 5)).getNano());
+        assertEquals(123_456_000, CurrentDateTime.nanoPrecision(zdt, Literal.of(EMPTY, 6)).getNano());
+        assertEquals(123_456_700, CurrentDateTime.nanoPrecision(zdt, Literal.of(EMPTY, 7)).getNano());
+        assertEquals(123_456_780, CurrentDateTime.nanoPrecision(zdt, Literal.of(EMPTY, 8)).getNano());
+        assertEquals(123_456_789, CurrentDateTime.nanoPrecision(zdt, Literal.of(EMPTY, 9)).getNano());
     }
 }

x-pack/plugin/sql/src/test/java/org/elasticsearch/xpack/sql/parser/ExpressionTests.java

@@ -338,6 +338,22 @@ public class ExpressionTests extends ESTestCase {
         assertEquals("line 1:13: Invalid data type [INVALID] provided", ex.getMessage());
     }
 
+    public void testCurrentDate() {
+        Expression expr = parser.createExpression("CURRENT_DATE");
+        assertEquals(UnresolvedFunction.class, expr.getClass());
+        UnresolvedFunction ur = (UnresolvedFunction) expr;
+        assertEquals("CURRENT_DATE", ur.sourceText());
+        assertEquals(0, ur.children().size());
+    }
+
+    public void testCurrentDateWithParentheses() {
+        Expression expr = parser.createExpression("CURRENT_DATE(  )");
+        assertEquals(UnresolvedFunction.class, expr.getClass());
+        UnresolvedFunction ur = (UnresolvedFunction) expr;
+        assertEquals("CURRENT_DATE(  )", ur.sourceText());
+        assertEquals(0, ur.children().size());
+    }
+
     public void testCurrentTimestamp() {
         Expression expr = parser.createExpression("CURRENT_TIMESTAMP");
         assertEquals(UnresolvedFunction.class, expr.getClass());
@@ -373,4 +389,4 @@ public class ExpressionTests extends ESTestCase {
         Expression expr = parser.createExpression(s);
         assertEquals(s, expr.sourceText());
     }
-}
+}

x-pack/plugin/sql/src/test/java/org/elasticsearch/xpack/sql/tree/NodeSubclassTests.java

@@ -92,8 +92,7 @@ import static org.mockito.Mockito.mock;
  */
 public class NodeSubclassTests<T extends B, B extends Node<B>> extends ESTestCase {
 
-
-    private static final List<Class<?>> CLASSES_WITH_MIN_TWO_CHILDREN = Arrays.<Class<?>> asList(IfNull.class, In.class, InPipe.class,
+    private static final List<Class<?>> CLASSES_WITH_MIN_TWO_CHILDREN = Arrays.asList(IfNull.class, In.class, InPipe.class,
             Percentile.class, Percentiles.class, PercentileRanks.class);
 
     private final Class<T> subclass;
@@ -138,9 +137,7 @@ public class NodeSubclassTests<T extends B, B extends Node<B>> extends ESTestCas
             Type changedArgType = argTypes[changedArgOffset];
             Object changedArgValue = randomValueOtherThan(nodeCtorArgs[changedArgOffset], () -> makeArg(changedArgType));
 
-            B transformed = node.transformNodeProps(prop -> {
-                return Objects.equals(prop, originalArgValue) ? changedArgValue : prop;
-            }, Object.class);
+            B transformed = node.transformNodeProps(prop -> Objects.equals(prop, originalArgValue) ? changedArgValue : prop, Object.class);
 
             if (node.children().contains(originalArgValue) || node.children().equals(originalArgValue)) {
                 if (node.children().equals(emptyList()) && originalArgValue.equals(emptyList())) {