Additional support for older Informix versions

Author: VladoKuruc

hibernate-community-dialects/src/main/java/org/hibernate/community/dialect/InformixDialect.java

@@ -466,7 +466,7 @@ protected <T extends JdbcOperation> SqlAstTranslator<T> buildTranslator(
 	@Override
 	public String extractPattern(TemporalUnit unit) {
 		return switch ( unit ) {
-			case SECOND -> "to_number(to_char(?2,'%S.%F3'))";
+			case SECOND -> getVersion().isBefore( 11, 70 ) ?	"to_number(to_char(?2,'%S%F3'))" : "to_number(to_char(?2,'%S.%F3'))";
 			case MINUTE -> "to_number(to_char(?2,'%M'))";
 			case HOUR -> "to_number(to_char(?2,'%H'))";
 			case DAY_OF_WEEK -> "(weekday(?2)+1)";
@@ -536,8 +536,8 @@ public String getAddPrimaryKeyConstraintString(String constraintName) {
 
 	@Override
 	public String getTruncateTableStatement(String tableName) {
-		return super.getTruncateTableStatement( tableName )
-			+ " reuse storage keep statistics";
+		return super.getTruncateTableStatement( tableName ) + " reuse storage"
+				+ ( getVersion().isSameOrAfter( 12, 10 ) ? " keep statistics" : "" );
 	}
 
 	@Override
@@ -751,7 +751,7 @@ public boolean isCurrentTimestampSelectStringCallable() {
 
 	@Override
 	public String getCurrentTimestampSelectString() {
-		return "select sysdate";
+		return "select sysdate" + (getVersion().isBefore( 12, 10 ) ? " from informix.systables where tabid=1" : "");
 	}
 
 	@Override @SuppressWarnings("deprecation")
@@ -1121,6 +1121,16 @@ public boolean supportsCrossJoin() {
 		return false;
 	}
 
+	@Override
+	public boolean supportsIntersect(){
+		return getVersion().isSameOrAfter( 12,10 );
+	}
+
+	public boolean supportsSubqueryOnMutatingTable() {
+		//tested on version 11.50, 14.10
+		return getVersion().isAfter( 11, 50);
+	}
+
 	@Override
 	public boolean supportsRowValueConstructorSyntax() {
 		return false;
@@ -1136,6 +1146,11 @@ public boolean supportsRowValueConstructorSyntaxInInList() {
 		return false;
 	}
 
+	@Override
+	public boolean supportsWithClause() {
+		return getVersion().isSameOrAfter( 14,10 );
+	}
+
 	@Override
 	public boolean requiresColumnListInCreateView() {
 		return true;

hibernate-core/src/test/java/org/hibernate/orm/test/hql/HQLTest.java

@@ -1487,6 +1487,7 @@ public void test_hql_aggregate_functions_example_3() {
 	}
 
 	@Test
+	@SkipForDialect( dialectClass = InformixDialect.class, majorVersion = 11, minorVersion = 50, reason = "Informix does not support case expressions within count function")
 	public void test_hql_aggregate_functions_simple_filter_example() {
 		doInJPA(this::entityManagerFactory, entityManager -> {
 			//tag::hql-aggregate-functions-simple-filter-example[]
@@ -1502,6 +1503,7 @@ public void test_hql_aggregate_functions_simple_filter_example() {
 	}
 
 	@Test
+	@SkipForDialect( dialectClass = InformixDialect.class, majorVersion = 11, minorVersion = 50, reason = "Informix does not support case expressions within count function")
 	public void test_hql_aggregate_functions_filter_example() {
 		doInJPA(this::entityManagerFactory, entityManager -> {
 			//tag::hql-aggregate-functions-filter-example[]
@@ -1647,6 +1649,7 @@ public void test_hql_length_function_example() {
 	}
 
 	@Test
+	@SkipForDialect( dialectClass = InformixDialect.class, majorVersion = 11, minorVersion = 70, reason = "Informix does not support locate function")
 	public void test_hql_locate_function_example() {
 		doInJPA(this::entityManagerFactory, entityManager -> {
 			//tag::hql-locate-function-example[]
@@ -1661,6 +1664,7 @@ public void test_hql_locate_function_example() {
 	}
 
 	@Test
+	@SkipForDialect( dialectClass = InformixDialect.class, majorVersion = 11, minorVersion = 70, reason = "Informix does not support position function")
 	public void test_hql_position_function_example() {
 		doInJPA(this::entityManagerFactory, entityManager -> {
 			//tag::hql-position-function-example[]