Fix invokation of overriden function without a schema name

h2/src/main/org/h2/command/Parser.java

@@ -2707,7 +2707,7 @@ public class Parser {
         return orderList;
     }
 
-    private JavaFunction readJavaFunction(Schema schema, String functionName) {
+    private JavaFunction readJavaFunction(Schema schema, String functionName, boolean throwIfNotFound) {
         FunctionAlias functionAlias = null;
         if (schema != null) {
             functionAlias = schema.findFunction(functionName);
@@ -2716,7 +2716,11 @@ public class Parser {
                     functionName);
         }
         if (functionAlias == null) {
-            throw DbException.get(ErrorCode.FUNCTION_NOT_FOUND_1, functionName);
+            if (throwIfNotFound) {
+                throw DbException.get(ErrorCode.FUNCTION_NOT_FOUND_1, functionName);
+            } else {
+                return null;
+            }
         }
         Expression[] args;
         ArrayList<Expression> argList = New.arrayList();
@@ -2761,7 +2765,14 @@ public class Parser {
 
     private Expression readFunction(Schema schema, String name) {
         if (schema != null) {
-            return readJavaFunction(schema, name);
+            return readJavaFunction(schema, name, true);
+        }
+        boolean allowOverride = database.isAllowBuiltinAliasOverride();
+        if (allowOverride) {
+            JavaFunction jf = readJavaFunction(null, name, false);
+            if (jf != null) {
+                return jf;
+            }
         }
         AggregateType agg = getAggregateType(name);
         if (agg != null) {
@@ -2773,7 +2784,10 @@ public class Parser {
             if (aggregate != null) {
                 return readJavaAggregate(aggregate);
             }
-            return readJavaFunction(null, name);
+            if (allowOverride) {
+                throw DbException.get(ErrorCode.FUNCTION_NOT_FOUND_1, name);
+            }
+            return readJavaFunction(null, name, true);
         }
         switch (function.getFunctionType()) {
         case Function.CAST: {

h2/src/test/org/h2/test/scripts/ddl/createAlias.sql

@@ -68,6 +68,12 @@ SET BUILTIN_ALIAS_OVERRIDE=1;
 CREATE ALIAS TRUNC FOR "java.lang.Math.floor(double)";
 > ok
 
+SELECT TRUNC(1.5);
+>> 1.0
+
+SELECT TRUNC(-1.5);
+>> -2.0
+
 DROP ALIAS TRUNC;
 > ok