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[CALCITE-6730] Add CONVERT function(enabled in Oracle library)
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core/src/main/java/org/apache/calcite/sql/fun/SqlOracleConvertFunction.java
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|---|---|---|
| @@ -0,0 +1,123 @@ | ||
| /* | ||
| * 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.calcite.sql.fun; | ||
|
|
||
| import org.apache.calcite.rel.type.RelDataType; | ||
| import org.apache.calcite.rex.RexCallBinding; | ||
| import org.apache.calcite.sql.SqlCall; | ||
| import org.apache.calcite.sql.SqlCallBinding; | ||
| import org.apache.calcite.sql.SqlFunctionCategory; | ||
| import org.apache.calcite.sql.SqlIdentifier; | ||
| import org.apache.calcite.sql.SqlKind; | ||
| import org.apache.calcite.sql.SqlNode; | ||
| import org.apache.calcite.sql.SqlOperandCountRange; | ||
| import org.apache.calcite.sql.SqlOperatorBinding; | ||
| import org.apache.calcite.sql.SqlUtil; | ||
| import org.apache.calcite.sql.type.ReturnTypes; | ||
| import org.apache.calcite.sql.type.SqlOperandCountRanges; | ||
| import org.apache.calcite.sql.type.SqlTypeUtil; | ||
| import org.apache.calcite.sql.validate.SqlValidator; | ||
| import org.apache.calcite.sql.validate.SqlValidatorScope; | ||
|
|
||
| import java.nio.charset.Charset; | ||
| import java.util.List; | ||
|
|
||
| import static org.apache.calcite.sql.type.NonNullableAccessors.getCollation; | ||
|
|
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| import static java.util.Objects.requireNonNull; | ||
|
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| /** Oracle's "CONVERT(charValue, destCharsetName[, srcCharsetName])" function. | ||
| * | ||
| * <p>It has a slight different semantics to standard SQL's | ||
| * {@link SqlStdOperatorTable#CONVERT} function on operands' order, and default | ||
| * charset will be used if the {@code srcCharsetName} is not specified. | ||
| * | ||
| * <p>Returns null if {@code charValue} is null or empty. */ | ||
| public class SqlOracleConvertFunction extends SqlConvertFunction { | ||
| //~ Constructors ----------------------------------------------------------- | ||
|
|
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| public SqlOracleConvertFunction(String name) { | ||
| super(name, SqlKind.CONVERT_ORACLE, ReturnTypes.ARG0, null, null, | ||
| SqlFunctionCategory.STRING); | ||
| } | ||
|
|
||
| //~ Methods ---------------------------------------------------------------- | ||
|
|
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| @Override public void validateCall(SqlCall call, SqlValidator validator, | ||
| SqlValidatorScope scope, SqlValidatorScope operandScope) { | ||
| final List<SqlNode> operands = call.getOperandList(); | ||
| operands.get(0).validateExpr(validator, scope); | ||
| // validate if the Charsets are legal. | ||
| assert operands.get(1) instanceof SqlIdentifier; | ||
| final String src_charset = operands.get(1).toString(); | ||
| SqlUtil.getCharset(src_charset); | ||
| if (operands.size() == 3) { | ||
| assert operands.get(2) instanceof SqlIdentifier; | ||
| final String dest_charset = operands.get(2).toString(); | ||
| SqlUtil.getCharset(dest_charset); | ||
| } | ||
| super.validateQuantifier(validator, call); | ||
| } | ||
|
|
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| @Override public RelDataType inferReturnType( | ||
| SqlOperatorBinding opBinding) { | ||
| final RelDataType ret = opBinding.getOperandType(0); | ||
| if (SqlTypeUtil.isNull(ret)) { | ||
| return ret; | ||
| } | ||
| final String descCharsetName; | ||
| if (opBinding instanceof SqlCallBinding) { | ||
| descCharsetName = ((SqlCallBinding) opBinding).getCall().operand(1).toString(); | ||
| } else { | ||
| descCharsetName = ((RexCallBinding) opBinding).getStringLiteralOperand(1); | ||
| } | ||
| assert descCharsetName != null; | ||
| Charset descCharset = SqlUtil.getCharset(descCharsetName); | ||
| return opBinding | ||
| .getTypeFactory().createTypeWithCharsetAndCollation(ret, descCharset, getCollation(ret)); | ||
| } | ||
|
|
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| @Override public RelDataType deriveType(SqlValidator validator, | ||
| SqlValidatorScope scope, SqlCall call) { | ||
| RelDataType nodeType = | ||
| validator.deriveType(scope, call.operand(0)); | ||
| requireNonNull(nodeType, "nodeType"); | ||
| RelDataType ret = validateOperands(validator, scope, call); | ||
| if (SqlTypeUtil.isNull(ret)) { | ||
| return ret; | ||
| } | ||
| Charset descCharset = SqlUtil.getCharset(call.operand(1).toString()); | ||
| return validator.getTypeFactory() | ||
| .createTypeWithCharsetAndCollation(ret, descCharset, getCollation(ret)); | ||
| } | ||
|
|
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| @Override public String getSignatureTemplate(final int operandsCount) { | ||
| switch (operandsCount) { | ||
| case 2: | ||
| return "{0}({1}, {2})"; | ||
| case 3: | ||
| return "{0}({1}, {2}, {3})"; | ||
| default: | ||
| throw new IllegalStateException("operandsCount should be 2 or 3, got " | ||
| + operandsCount); | ||
| } | ||
| } | ||
|
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| @Override public SqlOperandCountRange getOperandCountRange() { | ||
| return SqlOperandCountRanges.between(2, 3); | ||
| } | ||
| } |
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