SQL: Fix display size for DATE/DATETIME (#40669)

A full format for a DATETIME would be:
`2019-03-30T10:20:30.123+10:00` which is 29 chars long.

For DATE a full format would be: `2019-03-30T00:00:00.000+10:00`
which is also 29 chars long.

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

@@ -187,6 +187,10 @@ relative date/time filtering:
 include-tagged::{sql-specs}/docs/docs.csv-spec[filterNow]
 --------------------------------------------------
 
+[IMPORTANT]
+Currently, Using a _precision_ greater than 3 doesn't make any difference to the output of the
+function as the maximum number of second fractional digits returned is 3 (milliseconds).
+
 [[sql-functions-datetime-day]]
 ==== `DAY_OF_MONTH/DOM/DAY`
 

docs/reference/sql/language/data-types.asciidoc

@@ -26,7 +26,7 @@ s|SQL precision
 | <<keyword, `keyword`>>      | keyword       | VARCHAR     | 32,766
 | <<text, `text`>>            | text          | VARCHAR     | 2,147,483,647
 | <<binary, `binary`>>        | binary        | VARBINARY   | 2,147,483,647
-| <<date, `date`>>            | datetime      | TIMESTAMP   | 24
+| <<date, `date`>>            | datetime      | TIMESTAMP   | 29
 | <<ip, `ip`>>                | ip            | VARCHAR     | 39
 
 4+h| Complex types
@@ -66,7 +66,7 @@ s|SQL type
 s|SQL precision
 
 
-| date                      | 24
+| date                      | 29
 | time                      | 18
 | interval_year             | 7
 | interval_month            | 7

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

@@ -67,16 +67,16 @@ public abstract class SqlProtocolTestCase extends ESRestTestCase {
     
     public void testDateTimes() throws IOException {
         assertQuery("SELECT CAST('2019-01-14T12:29:25.000Z' AS DATETIME)", "CAST('2019-01-14T12:29:25.000Z' AS DATETIME)",
-            "datetime", "2019-01-14T12:29:25.000Z", 24);
+            "datetime", "2019-01-14T12:29:25.000Z", 29);
         assertQuery("SELECT CAST(-26853765751000 AS DATETIME)", "CAST(-26853765751000 AS DATETIME)",
-            "datetime", "1119-01-15T12:37:29.000Z", 24);
+            "datetime", "1119-01-15T12:37:29.000Z", 29);
         assertQuery("SELECT CAST(CAST('-26853765751000' AS BIGINT) AS DATETIME)", "CAST(CAST('-26853765751000' AS BIGINT) AS DATETIME)",
-            "datetime", "1119-01-15T12:37:29.000Z", 24);
+            "datetime", "1119-01-15T12:37:29.000Z", 29);
 
         assertQuery("SELECT CAST('2019-01-14' AS DATE)", "CAST('2019-01-14' AS DATE)",
-            "date", "2019-01-14T00:00:00.000Z", 24);
+            "date", "2019-01-14T00:00:00.000Z", 29);
         assertQuery("SELECT CAST(-26853765751000 AS DATE)", "CAST(-26853765751000 AS DATE)",
-            "date", "1119-01-15T00:00:00.000Z", 24);
+            "date", "1119-01-15T00:00:00.000Z", 29);
 
         assertQuery("SELECT CAST('12:29:25.123Z' AS TIME)", "CAST('12:29:25.123Z' AS TIME)",
             "time", "12:29:25.123Z", 18);

x-pack/plugin/sql/qa/src/main/resources/setup_mock_metadata_get_columns.sql

@@ -33,7 +33,7 @@ SELECT null, 'test1', 'name.keyword', 12, 'KEYWORD', 32766, 2147483647, null, nu
   null, null, 12, 0, 2147483647, 1, 'YES', null, null, null, null, 'NO', 'NO'
 FROM DUAL
 UNION ALL
-SELECT null, 'test2', 'date', 93, 'DATETIME', 24, 8, null, null,
+SELECT null, 'test2', 'date', 93, 'DATETIME', 29, 8, null, null,
   1, -- columnNullable
   null, null, 9, 3, null, 1, 'YES', null, null, null, null, 'NO', 'NO'
 FROM DUAL

x-pack/plugin/sql/src/main/java/org/elasticsearch/xpack/sql/type/DataType.java

@@ -44,12 +44,12 @@ public enum DataType {
     OBJECT(        "object",         JDBCType.STRUCT,    -1,                0,                 0,  false, false, false),
     NESTED(        "nested",         JDBCType.STRUCT,    -1,                0,                 0,  false, false, false),
     BINARY(        "binary",         JDBCType.VARBINARY, -1,                Integer.MAX_VALUE, Integer.MAX_VALUE,  false, false, false),
-    DATE(                            JDBCType.DATE,      Long.BYTES,        24,                24, false, false, true),
-    TIME(                            JDBCType.TIME,      Long.BYTES,        3,                 18, false, false, true),
     // since ODBC and JDBC interpret precision for Date as display size
-    // the precision is 23 (number of chars in ISO8601 with millis) + Z (the UTC timezone)
+    // the precision is 23 (number of chars in ISO8601 with millis) + 6 chars for the timezone (e.g.: +05:00)
     // see https://github.com/elastic/elasticsearch/issues/30386#issuecomment-386807288
-    DATETIME(      "date",           JDBCType.TIMESTAMP, Long.BYTES,        3,                 24, false, false, true),
+    DATE(                            JDBCType.DATE,      Long.BYTES,        3,                 29, false, false, true),
+    TIME(                            JDBCType.TIME,      Long.BYTES,        3,                 18, false, false, true),
+    DATETIME(      "date",           JDBCType.TIMESTAMP, Long.BYTES,        3,                 29, false, false, true),
     //
     // specialized types
     //

x-pack/plugin/sql/src/test/java/org/elasticsearch/xpack/sql/plan/logical/command/sys/SysColumnsTests.java

@@ -50,7 +50,7 @@ public class SysColumnsTests extends ESTestCase {
         assertEquals("date", name(row));
         assertEquals(Types.TIMESTAMP, sqlType(row));
         assertEquals(null, radix(row));
-        assertEquals(24, precision(row));
+        assertEquals(29, precision(row));
         assertEquals(8, bufferLength(row));
 
         row = rows.get(5);
@@ -173,7 +173,7 @@ public class SysColumnsTests extends ESTestCase {
         assertEquals("date", name(row));
         assertEquals((short) Types.TIMESTAMP, sqlType(row));
         assertEquals(null, radix(row));
-        assertEquals(24, precision(row));
+        assertEquals(29, precision(row));
         assertEquals(8, bufferLength(row));
         assertNull(decimalPrecision(row));
         assertEquals(Short.class, nullable(row).getClass());
@@ -308,7 +308,7 @@ public class SysColumnsTests extends ESTestCase {
         assertEquals("date", name(row));
         assertEquals(Types.TIMESTAMP, sqlType(row));
         assertEquals(null, radix(row));
-        assertEquals(24, precision(row));
+        assertEquals(29, precision(row));
         assertEquals(8, bufferLength(row));
         assertNull(decimalPrecision(row));
         assertEquals(Integer.class, nullable(row).getClass());
@@ -431,4 +431,4 @@ public class SysColumnsTests extends ESTestCase {
     private static Object sqlDataTypeSub(List<?> list) {
         return list.get(14);
     }
-}
+}