update database metadata

Author: Neenu1995

java-bigquery-jdbc/src/main/java/com/google/cloud/bigquery/jdbc/BigQueryDatabaseMetaData.java

@@ -4835,6 +4835,8 @@ private Tuple<String, String> determineEffectiveCatalogAndSchema(
 
   // BigQuery STRING represents Unicode character strings (UTF-8).
   // Standard JDBC maps UTF-8/Unicode data to Types.NVARCHAR rather than Types.VARCHAR.
+  // Precision and scale values for temporal types (TIMESTAMP, DATETIME, DATE, TIME) are
+  // aligned with BigQueryResultSetMetadata to ensure consistent metadata behavior.
   private static final Map<StandardSQLTypeName, ColumnTypeInfo> STANDARD_TYPE_INFO =
       ImmutableMap.<StandardSQLTypeName, ColumnTypeInfo>builder()
           .put(StandardSQLTypeName.INT64, new ColumnTypeInfo(Types.BIGINT, "INT64", 19, 0, 10))
@@ -4851,12 +4853,12 @@ private Tuple<String, String> determineEffectiveCatalogAndSchema(
               new ColumnTypeInfo(Types.NVARCHAR, "STRING", null, null, null))
           .put(
               StandardSQLTypeName.TIMESTAMP,
-              new ColumnTypeInfo(Types.TIMESTAMP, "TIMESTAMP", 29, null, null))
+              new ColumnTypeInfo(Types.TIMESTAMP, "TIMESTAMP", 26, 6, null))
           .put(
               StandardSQLTypeName.DATETIME,
-              new ColumnTypeInfo(Types.TIMESTAMP, "DATETIME", 29, null, null))
-          .put(StandardSQLTypeName.DATE, new ColumnTypeInfo(Types.DATE, "DATE", 10, null, null))
-          .put(StandardSQLTypeName.TIME, new ColumnTypeInfo(Types.TIME, "TIME", 15, null, null))
+              new ColumnTypeInfo(Types.TIMESTAMP, "DATETIME", 26, 6, null))
+          .put(StandardSQLTypeName.DATE, new ColumnTypeInfo(Types.DATE, "DATE", 10, 0, null))
+          .put(StandardSQLTypeName.TIME, new ColumnTypeInfo(Types.TIME, "TIME", 15, 6, null))
           .put(
               StandardSQLTypeName.GEOGRAPHY,
               new ColumnTypeInfo(Types.OTHER, "GEOGRAPHY", null, null, null))

java-bigquery-jdbc/src/test/java/com/google/cloud/bigquery/jdbc/BigQueryDatabaseMetaDataTest.java

@@ -320,8 +320,8 @@ public void testMapBigQueryTypeToJdbc_ScalarTypes() {
         dbMetadata.mapBigQueryTypeToJdbc(fieldTimestamp);
     assertEquals(Types.TIMESTAMP, infoTimestamp.jdbcType);
     assertEquals("TIMESTAMP", infoTimestamp.typeName);
-    assertEquals(Integer.valueOf(29), infoTimestamp.columnSize);
-    assertNull(infoTimestamp.decimalDigits);
+    assertEquals(Integer.valueOf(26), infoTimestamp.columnSize);
+    assertEquals(Integer.valueOf(6), infoTimestamp.decimalDigits);
     assertNull(infoTimestamp.numPrecRadix);
 
     // DATETIME -> TIMESTAMP
@@ -333,8 +333,8 @@ public void testMapBigQueryTypeToJdbc_ScalarTypes() {
         dbMetadata.mapBigQueryTypeToJdbc(fieldDateTime);
     assertEquals(Types.TIMESTAMP, infoDateTime.jdbcType);
     assertEquals("DATETIME", infoDateTime.typeName);
-    assertEquals(Integer.valueOf(29), infoDateTime.columnSize);
-    assertNull(infoDateTime.decimalDigits);
+    assertEquals(Integer.valueOf(26), infoDateTime.columnSize);
+    assertEquals(Integer.valueOf(6), infoDateTime.decimalDigits);
     assertNull(infoDateTime.numPrecRadix);
 
     // NUMERIC -> NUMERIC
@@ -402,6 +402,8 @@ public void testMapBigQueryTypeToJdbc_ScalarTypes() {
     BigQueryDatabaseMetaData.ColumnTypeInfo infoDate = dbMetadata.mapBigQueryTypeToJdbc(fieldDate);
     assertEquals(Types.DATE, infoDate.jdbcType);
     assertEquals("DATE", infoDate.typeName);
+    assertEquals(Integer.valueOf(10), infoDate.columnSize);
+    assertEquals(Integer.valueOf(0), infoDate.decimalDigits);
 
     // TIME
     Field fieldTime =
@@ -411,6 +413,8 @@ public void testMapBigQueryTypeToJdbc_ScalarTypes() {
     BigQueryDatabaseMetaData.ColumnTypeInfo infoTime = dbMetadata.mapBigQueryTypeToJdbc(fieldTime);
     assertEquals(Types.TIME, infoTime.jdbcType);
     assertEquals("TIME", infoTime.typeName);
+    assertEquals(Integer.valueOf(15), infoTime.columnSize);
+    assertEquals(Integer.valueOf(6), infoTime.decimalDigits);
 
     // STRUCT
     Field fieldStruct =
@@ -1295,7 +1299,7 @@ public void testCreateProcedureColumnRow_InOutTimestampParam() {
         String.valueOf(DatabaseMetaData.procedureColumnInOut), row.get(4).getStringValue());
     assertEquals(String.valueOf(Types.TIMESTAMP), row.get(5).getStringValue());
     assertEquals("TIMESTAMP", row.get(6).getStringValue());
-    assertEquals("29", row.get(7).getStringValue()); // PRECISION for TIMESTAMP
+    assertEquals("26", row.get(7).getStringValue()); // PRECISION for TIMESTAMP
   }
 
   @Test