/*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package com.facebook.presto.sql.analyzer;
import com.facebook.presto.metadata.Signature;
import com.facebook.presto.sql.tree.DefaultExpressionTraversalVisitor;
import com.facebook.presto.sql.tree.FunctionCall;
import static com.facebook.presto.metadata.FunctionKind.WINDOW;
import static com.facebook.presto.sql.analyzer.SemanticErrorCode.WINDOW_REQUIRES_OVER;
import static java.util.Objects.requireNonNull;
class WindowFunctionValidator
extends DefaultExpressionTraversalVisitor<Void, Analysis>
{
@Override
protected Void visitFunctionCall(FunctionCall functionCall, Analysis analysis)
{
requireNonNull(analysis, "analysis is null");
Signature signature = analysis.getFunctionSignature(functionCall);
if (signature != null && signature.getKind() == WINDOW && !functionCall.getWindow().isPresent()) {
throw new SemanticException(WINDOW_REQUIRES_OVER, functionCall, "Window function %s requires an OVER clause", signature.getName());
}
return super.visitFunctionCall(functionCall, analysis);
}
}