HHH-3404 regexp on Informix

Not implemented: support for 'ilike regexp'

Author: gavinking

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

@@ -367,6 +367,8 @@ public void initializeFunctionRegistry(FunctionContributions functionContributio
 		final TypeConfiguration typeConfiguration = functionContributions.getTypeConfiguration();
 		final BasicType<String> stringBasicType =
 				typeConfiguration.getBasicTypeRegistry().resolve( StandardBasicTypes.STRING );
+		final BasicType<Boolean> booleanBasicType =
+				typeConfiguration.getBasicTypeRegistry().resolve( StandardBasicTypes.BOOLEAN );
 
 		functionRegistry.registerAlternateKey( "var_samp", "variance" );
 
@@ -408,6 +410,12 @@ public void initializeFunctionRegistry(FunctionContributions functionContributio
 		// parameter arguments to trim() require a cast
 		functionContributions.getFunctionRegistry().register( "trim",
 				new TrimFunction( this, typeConfiguration, SqlAstNodeRenderingMode.NO_UNTYPED ) );
+
+		//TODO: emulate support for the 'i' flag argument
+		functionRegistry.namedDescriptorBuilder( "regexp_like", "regex_match"  )
+				.setParameterTypes( STRING, STRING )
+				.setInvariantType( booleanBasicType )
+				.register();
 	}
 
 	@Override

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

@@ -2671,7 +2671,6 @@ public void regexpLike() {
 				.setParameterTypes( STRING, STRING, STRING )
 				.setInvariantType( booleanType )
 				.register();
-
 	}
 
 	/**

hibernate-core/src/test/java/org/hibernate/orm/test/query/hql/RegexTest.java

@@ -4,6 +4,7 @@
  */
 package org.hibernate.orm.test.query.hql;
 
+import org.hibernate.community.dialect.InformixDialect;
 import org.hibernate.dialect.HSQLDialect;
 import org.hibernate.dialect.MariaDBDialect;
 import org.hibernate.dialect.OracleDialect;
@@ -41,6 +42,8 @@ void testInSelect(EntityManagerFactoryScope scope) {
 			reason = "regexp_like coming in 2025")
 	@SkipForDialect(dialectClass = SybaseASEDialect.class,
 			reason = "no regex support in Sybase ASE")
+	@SkipForDialect(dialectClass = InformixDialect.class,
+			reason = "This could be made to work on Informix by changing the flags")
 	void testInSelectCaseInsensitive(EntityManagerFactoryScope scope) {
 		if ( !( scope.getDialect() instanceof OracleDialect dialect
 				&& ( dialect.isAutonomous() || dialect.getVersion().isBefore( 23 ) ) ) ) {