org.apache.flink.table.planner.plan.type.NumericExceptFirstOperandChecker Maven / Gradle / Ivy
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* Licensed to the Apache Software Foundation (ASF) under one
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* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you 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,
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* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.apache.flink.table.planner.plan.type;
import org.apache.calcite.sql.SqlCallBinding;
import org.apache.calcite.sql.SqlOperandCountRange;
import org.apache.calcite.sql.SqlOperator;
import org.apache.calcite.sql.SqlUtil;
import org.apache.calcite.sql.type.SqlOperandCountRanges;
import org.apache.calcite.sql.type.SqlOperandTypeChecker;
import org.apache.calcite.sql.type.SqlTypeUtil;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.Collections;
import java.util.List;
/**
* Parameter type-checking strategy where all operand types except first one must be numeric type.
*/
public class NumericExceptFirstOperandChecker implements SqlOperandTypeChecker {
private int nOperands;
public NumericExceptFirstOperandChecker(int nOperands) {
this.nOperands = nOperands;
}
@Override
public boolean checkOperandTypes(SqlCallBinding callBinding, boolean throwOnFailure) {
for (int i = 1; i < callBinding.getOperandCount(); i++) {
if (!SqlTypeUtil.isNumeric(callBinding.getOperandType(i))) {
if (!throwOnFailure) {
return false;
}
throw callBinding.newValidationSignatureError();
}
}
return true;
}
@Override
public SqlOperandCountRange getOperandCountRange() {
if (nOperands == -1) {
return SqlOperandCountRanges.any();
} else {
return SqlOperandCountRanges.of(nOperands);
}
}
@Override
public String getAllowedSignatures(SqlOperator op, String opName) {
final String anyType = "ANY_TYPE";
final String numericType = "NUMERIC_TYPE";
if (nOperands == -1) {
return SqlUtil.getAliasedSignature(
op, opName, Arrays.asList(anyType, numericType, "..."));
} else {
List types = new ArrayList<>();
types.add(anyType);
types.addAll(Collections.nCopies(nOperands - 1, numericType));
return SqlUtil.getAliasedSignature(op, opName, types);
}
}
@Override
public Consistency getConsistency() {
return Consistency.NONE;
}
@Override
public boolean isOptional(int i) {
return false;
}
}