com.hazelcast.org.apache.calcite.sql.validate.SetopNamespace Maven / Gradle / Ivy
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* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file 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,
* 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.hazelcast.org.apache.calcite.sql.validate;
import com.hazelcast.org.apache.calcite.rel.type.RelDataType;
import com.hazelcast.org.apache.calcite.sql.SqlCall;
import com.hazelcast.org.apache.calcite.sql.SqlKind;
import com.hazelcast.org.apache.calcite.sql.SqlNode;
import com.hazelcast.org.apache.calcite.util.Util;
import com.hazelcast.org.checkerframework.checker.nullness.qual.Nullable;
import static com.hazelcast.org.apache.calcite.util.Static.RESOURCE;
import static java.util.Objects.requireNonNull;
/**
* Namespace based upon a set operation (UNION, INTERSECT, EXCEPT).
*/
public class SetopNamespace extends AbstractNamespace {
//~ Instance fields --------------------------------------------------------
private final SqlCall call;
//~ Constructors -----------------------------------------------------------
/**
* Creates a SetopNamespace
.
*
* @param validator Validator
* @param call Call to set operator
* @param enclosingNode Enclosing node
*/
protected SetopNamespace(
SqlValidatorImpl validator,
SqlCall call,
SqlNode enclosingNode) {
super(validator, enclosingNode);
this.call = call;
}
//~ Methods ----------------------------------------------------------------
@Override public @Nullable SqlNode getNode() {
return call;
}
@Override public SqlMonotonicity getMonotonicity(String columnName) {
SqlMonotonicity monotonicity = null;
int index = getRowType().getFieldNames().indexOf(columnName);
if (index < 0) {
return SqlMonotonicity.NOT_MONOTONIC;
}
for (SqlNode operand : call.getOperandList()) {
final SqlValidatorNamespace namespace =
requireNonNull(
validator.getNamespace(operand),
() -> "namespace for " + operand);
monotonicity = combine(monotonicity,
namespace.getMonotonicity(
namespace.getRowType().getFieldNames().get(index)));
}
return Util.first(monotonicity, SqlMonotonicity.NOT_MONOTONIC);
}
private static SqlMonotonicity combine(@Nullable SqlMonotonicity m0,
SqlMonotonicity m1) {
if (m0 == null) {
return m1;
}
if (m1 == null) {
return m0;
}
if (m0 == m1) {
return m0;
}
if (m0.unstrict() == m1) {
return m1;
}
if (m1.unstrict() == m0) {
return m0;
}
return SqlMonotonicity.NOT_MONOTONIC;
}
@Override public RelDataType validateImpl(RelDataType targetRowType) {
switch (call.getKind()) {
case UNION:
case INTERSECT:
case EXCEPT:
final SqlValidatorScope scope = requireNonNull(
validator.scopes.get(call),
() -> "scope for " + call);
for (SqlNode operand : call.getOperandList()) {
if (!operand.isA(SqlKind.QUERY)) {
throw validator.newValidationError(operand,
RESOURCE.needQueryOp(operand.toString()));
}
validator.validateQuery(operand, scope, targetRowType);
}
return call.getOperator().deriveType(
validator,
scope,
call);
default:
throw new AssertionError("Not a query: " + call.getKind());
}
}
}
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