org.apache.druid.sql.calcite.expression.UnaryFunctionOperatorConversion.java Source code

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Here is the source code for org.apache.druid.sql.calcite.expression.UnaryFunctionOperatorConversion.java

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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 org.apache.druid.sql.calcite.expression;

import com.google.common.collect.Iterables;
import org.apache.calcite.rex.RexNode;
import org.apache.calcite.sql.SqlOperator;
import org.apache.druid.java.util.common.StringUtils;
import org.apache.druid.sql.calcite.planner.PlannerContext;
import org.apache.druid.sql.calcite.table.RowSignature;

public class UnaryFunctionOperatorConversion implements SqlOperatorConversion {
    private final SqlOperator operator;
    private final String druidOperator;

    public UnaryFunctionOperatorConversion(final SqlOperator operator, final String druidOperator) {
        this.operator = operator;
        this.druidOperator = druidOperator;
    }

    @Override
    public SqlOperator calciteOperator() {
        return operator;
    }

    @Override
    public DruidExpression toDruidExpression(final PlannerContext plannerContext, final RowSignature rowSignature,
            final RexNode rexNode) {
        return OperatorConversions.convertCall(plannerContext, rowSignature, rexNode,
                operands -> DruidExpression.fromExpression(StringUtils.format("%s(%s)", druidOperator,
                        Iterables.getOnlyElement(operands).getExpression())));
    }
}