HHH-19365 - feat(dialect): Optimize GaussDB dialect support

- Add multiple improvements to GaussDB dialect, including:
- Add support for the less than operator (<)
- Optimize the registration of JSON-related functions
- Adjust the date format function to adapt to the characteristics of GaussDB
- Fix some GaussDB-specific bugs
- Add special processing logic for GaussDB in multiple tests
- Add support for GaussDB-specific SQL statement structure

Author: SweetWuXiaoMei

hibernate-core/src/main/java/org/hibernate/dialect/GaussDBCastingIntervalSecondJdbcType.java

@@ -80,7 +80,7 @@ public void appendWriteExpression(
 			Dialect dialect) {
 		appender.append( '(' );
 		appender.append( writeExpression );
-		appender.append( "*interval'1 second)" );
+		appender.append( "*interval'1 second')" );
 	}
 
 	@Override

hibernate-core/src/main/java/org/hibernate/dialect/GaussDBDialect.java

@@ -178,6 +178,10 @@ public GaussDBDialect(DatabaseVersion version) {
 		this.optionalTableUpdateStrategy = determineOptionalTableUpdateStrategy( version );
 	}
 
+	public boolean supportsColumnCheck() {
+		return false;
+	}
+
 	private static OptionalTableUpdateStrategy determineOptionalTableUpdateStrategy(DatabaseVersion version) {
 		return version.isSameOrAfter( DatabaseVersion.make( 15, 0 ) )
 				? GaussDBDialect::usingMerge
@@ -553,6 +557,7 @@ public void initializeFunctionRegistry(FunctionContributions functionContributio
 		functionFactory.insert_overlay();
 		functionFactory.overlay();
 		functionFactory.soundex(); //was introduced apparently
+		functionFactory.format_toChar_gauss();
 
 		functionFactory.locate_positionSubstring();
 		functionFactory.windowFunctions();
@@ -590,6 +595,7 @@ public void initializeFunctionRegistry(FunctionContributions functionContributio
 		functionFactory.jsonInsert_gaussdb();
 		functionFactory.jsonArray_gaussdb();
 		functionFactory.jsonMergepatch_gaussdb();
+		functionFactory.jsonArrayInsert_gauss();
 
 		functionFactory.xmlelement();
 		functionFactory.xmlcomment();

hibernate-core/src/main/java/org/hibernate/dialect/function/CommonFunctionFactory.java

@@ -1469,7 +1469,7 @@ public void localtimeLocaltimestamp() {
 				.setUseParenthesesWhenNoArgs( false )
 				.register();
 		functionRegistry.noArgsBuilder( "local_datetime", "localtimestamp" )
-				.setInvariantType( basicTypeRegistry.resolve( StandardBasicTypes.LOCAL_DATE_TIME ) )
+				.setInvariantType ( basicTypeRegistry.resolve( StandardBasicTypes.LOCAL_DATE_TIME ) )
 				.setUseParenthesesWhenNoArgs( false )
 				.register();
 	}
@@ -2573,6 +2573,15 @@ public void format_toChar() {
 		functionRegistry.register( "format", new FormatFunction( "to_char", typeConfiguration ) );
 	}
 
+	/**
+	 * Usually Oracle-style (except for Informix which quite close to MySQL-style)
+	 *
+	 * @see org.hibernate.dialect.OracleDialect#datetimeFormat
+	 */
+	public void format_toChar_gauss() {
+		functionRegistry.register( "format", new GaussDBFormatFunction( "to_char", typeConfiguration ) );
+	}
+
 	/**
 	 * MySQL-style (also Ingres)
 	 *
@@ -4177,6 +4186,13 @@ public void jsonArrayInsert_postgresql() {
 		functionRegistry.register( "json_array_insert", new PostgreSQLJsonArrayInsertFunction( typeConfiguration ) );
 	}
 
+	/**
+	 * gauss json_array_insert() function
+	 */
+	public void jsonArrayInsert_gauss() {
+		functionRegistry.register( "json_array_insert", new GaussDBJsonArrayInsertFunction( typeConfiguration ) );
+	}
+
 	/**
 	 * MySQL json_array_insert() function
 	 */