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SQL: Add STRING_FORMAT function. (apache#7327)
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105 changes: 105 additions & 0 deletions
105
.../java/org/apache/druid/sql/calcite/expression/builtin/StringFormatOperatorConversion.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. | ||
| */ | ||
|
|
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| package org.apache.druid.sql.calcite.expression.builtin; | ||
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| import org.apache.calcite.rel.type.RelDataType; | ||
| import org.apache.calcite.rex.RexNode; | ||
| import org.apache.calcite.sql.SqlCallBinding; | ||
| import org.apache.calcite.sql.SqlFunction; | ||
| import org.apache.calcite.sql.SqlFunctionCategory; | ||
| import org.apache.calcite.sql.SqlOperandCountRange; | ||
| import org.apache.calcite.sql.SqlOperator; | ||
| import org.apache.calcite.sql.type.SqlOperandCountRanges; | ||
| import org.apache.calcite.sql.type.SqlOperandTypeChecker; | ||
| import org.apache.calcite.sql.type.SqlTypeName; | ||
| import org.apache.druid.java.util.common.StringUtils; | ||
| import org.apache.druid.sql.calcite.expression.DruidExpression; | ||
| import org.apache.druid.sql.calcite.expression.OperatorConversions; | ||
| import org.apache.druid.sql.calcite.expression.SqlOperatorConversion; | ||
| import org.apache.druid.sql.calcite.planner.PlannerContext; | ||
| import org.apache.druid.sql.calcite.table.RowSignature; | ||
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| public class StringFormatOperatorConversion implements SqlOperatorConversion | ||
| { | ||
| private static final SqlFunction SQL_FUNCTION = OperatorConversions | ||
| .operatorBuilder("STRING_FORMAT") | ||
| .operandTypeChecker(new StringFormatOperandTypeChecker()) | ||
| .functionCategory(SqlFunctionCategory.STRING) | ||
| .returnType(SqlTypeName.VARCHAR) | ||
| .build(); | ||
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| @Override | ||
| public SqlOperator calciteOperator() | ||
| { | ||
| return SQL_FUNCTION; | ||
| } | ||
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| @Override | ||
| public DruidExpression toDruidExpression( | ||
| final PlannerContext plannerContext, | ||
| final RowSignature rowSignature, | ||
| final RexNode rexNode | ||
| ) | ||
| { | ||
| return OperatorConversions.convertCall(plannerContext, rowSignature, rexNode, "format"); | ||
| } | ||
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| private static class StringFormatOperandTypeChecker implements SqlOperandTypeChecker | ||
| { | ||
| @Override | ||
| public boolean checkOperandTypes(SqlCallBinding callBinding, boolean throwOnFailure) | ||
| { | ||
| final RelDataType firstArgType = callBinding.getOperandType(0); | ||
| if (SqlTypeName.CHAR_TYPES.contains(firstArgType.getSqlTypeName())) { | ||
| return true; | ||
| } else { | ||
| if (throwOnFailure) { | ||
| throw callBinding.newValidationSignatureError(); | ||
| } else { | ||
| return false; | ||
| } | ||
| } | ||
| } | ||
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| @Override | ||
| public SqlOperandCountRange getOperandCountRange() | ||
| { | ||
| return SqlOperandCountRanges.from(1); | ||
| } | ||
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| @Override | ||
| public String getAllowedSignatures(SqlOperator op, String opName) | ||
| { | ||
| return StringUtils.format("%s(CHARACTER, [ANY, ...])", opName); | ||
| } | ||
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| @Override | ||
| public Consistency getConsistency() | ||
| { | ||
| return Consistency.NONE; | ||
| } | ||
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| @Override | ||
| public boolean isOptional(int i) | ||
| { | ||
| return i > 0; | ||
| } | ||
| } | ||
| } |
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