Old Informix doesn't support the 'select 1' syntax, for example

Author: VladoKuruc

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

@@ -1111,6 +1111,11 @@ public String getDual() {
 		return "(select 0 from systables where tabid=1)";
 	}
 
+	@Override
+	public String getFromDualForSelectOnly() {
+		return getVersion().isBefore( 12,10 ) ?	" from " + getDual() + " dual" : "";
+	}
+
 	@Override
 	public boolean supportsCrossJoin() {
 		return false;

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

@@ -50,7 +50,8 @@ protected void visitQueryClauses(QuerySpec querySpec) {
 		visitSelectClause( querySpec.getSelectClause() );
 		visitFromClause( querySpec.getFromClause() );
 		if ( !hasFrom( querySpec.getFromClause() )
-				&& hasWhere( querySpec.getWhereClauseRestrictions() ) ) {
+				&& hasWhere( querySpec.getWhereClauseRestrictions() )
+				&& getDialect().getFromDualForSelectOnly().isBlank() ) {
 			append( " from " );
 			append( getDual() );
 		}