add outer

be/src/vec/columns/column_array.cpp

@@ -413,7 +413,7 @@ void ColumnArray::insert(const Field& x) {
 }
 
 void ColumnArray::insert_from(const IColumn& src_, size_t n) {
-    DCHECK(n < src_.size()) << n << " " << src_.size();
+    DCHECK_LT(n, src_.size());
     const ColumnArray& src = assert_cast<const ColumnArray&>(src_);
     size_t size = src.size_at(n);
     size_t offset = src.offset_at(n);

fe/fe-core/src/main/java/org/apache/doris/catalog/Env.java

@@ -5365,6 +5365,15 @@ public void createFunction(CreateFunctionStmt stmt) throws UserException {
         } else {
             Database db = getInternalCatalog().getDbOrDdlException(stmt.getFunctionName().getDb());
             db.addFunction(stmt.getFunction(), stmt.isIfNotExists());
+            if (stmt.getFunction().isUDTFunction()) {
+                // all of the table function in doris will have two function
+                // one is the noraml, and another is outer, the different of them is deal with
+                // empty: whether need to insert NULL result value
+                Function outerFunction = stmt.getFunction().clone();
+                FunctionName name = outerFunction.getFunctionName();
+                name.setFn(name.getFunction() + "_outer");
+                db.addFunction(outerFunction, stmt.isIfNotExists());
+            }
         }
     }
 

fe/fe-core/src/main/java/org/apache/doris/catalog/Function.java

@@ -198,6 +198,8 @@ public Function(Function other) {
             System.arraycopy(other.argTypes, 0, this.argTypes, 0, other.argTypes.length);
         }
         this.checksum = other.checksum;
+        this.isGlobal = other.isGlobal;
+        this.isUDTFunction = other.isUDTFunction;
     }
 
     public void setNestedFunction(Function nestedFunction) {

fe/fe-core/src/main/java/org/apache/doris/catalog/ScalarFunction.java

@@ -168,6 +168,21 @@ public static ScalarFunction createUdf(
         return fn;
     }
 
+    public ScalarFunction(ScalarFunction other) {
+        super(other);
+        if (other == null) {
+            return;
+        }
+        symbolName = other.symbolName;
+        prepareFnSymbol = other.prepareFnSymbol;
+        closeFnSymbol = other.closeFnSymbol;
+    }
+
+    @Override
+    public Function clone() {
+        return new ScalarFunction(this);
+    }
+
     public void setSymbolName(String s) {
         symbolName = s;
     }