Old Informix doesn't support table aliases in DELETE statements. Issue HHH-18473 remains open only for joins and conditions within a DELETE.

Author: VladoKuruc

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

@@ -1147,6 +1147,6 @@ public IdentifierHelper buildIdentifierHelper(IdentifierHelperBuilder builder, @
 
 	@Override
 	public DmlTargetColumnQualifierSupport getDmlTargetColumnQualifierSupport() {
-		return DmlTargetColumnQualifierSupport.TABLE_ALIAS;
+		return getVersion().isSameOrAfter( 12,10 ) ? DmlTargetColumnQualifierSupport.TABLE_ALIAS : DmlTargetColumnQualifierSupport.NONE;
 	}
 }

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

@@ -321,8 +321,10 @@ public void visitBinaryArithmeticExpression(BinaryArithmeticExpression arithmeti
 	@Override
 	protected void renderDmlTargetTableExpression(NamedTableReference tableReference) {
 		super.renderDmlTargetTableExpression( tableReference );
-		if ( getClauseStack().getCurrent() != Clause.INSERT ) {
-			renderTableReferenceIdentificationVariable( tableReference );
+		if (getDialect().getVersion().isSameOrAfter( 12, 10 )) {
+			if ( getClauseStack().getCurrent() != Clause.INSERT ) {
+				renderTableReferenceIdentificationVariable( tableReference );
+			}
 		}
 	}
 

hibernate-core/src/test/java/org/hibernate/orm/test/query/QueryTimeOutTest.java

@@ -10,6 +10,7 @@
 import java.util.Map;
 
 import org.hibernate.cfg.AvailableSettings;
+import org.hibernate.community.dialect.InformixDialect;
 import org.hibernate.dialect.AbstractTransactSQLDialect;
 import org.hibernate.dialect.OracleDialect;
 import org.hibernate.dialect.SybaseDialect;
@@ -78,6 +79,10 @@ else if ( DialectContext.getDialect() instanceof SybaseDialect ) {
 		else if ( DialectContext.getDialect() instanceof AbstractTransactSQLDialect ) {
 			baseQuery = "update ae1_0 set name=? from AnEntity ae1_0";
 		}
+		else if (DialectContext.getDialect() instanceof InformixDialect && DialectContext.getDialect().getVersion()
+				.isBefore(12, 10)) {
+			baseQuery = "update AnEntity set name=?";
+		}
 		else {
 			baseQuery = "update AnEntity ae1_0 set name=?";
 		}