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[FLINK-3226] Translation of scalar function substring()
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30 changes: 30 additions & 0 deletions
30
...s/flink-table/src/main/scala/org/apache/flink/api/table/codegen/calls/CallGenerator.scala
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,30 @@ | ||
| /* | ||
| * 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 | ||
| * | ||
| * https://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.flink.api.table.codegen.calls | ||
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| import org.apache.flink.api.table.codegen.{CodeGenerator, GeneratedExpression} | ||
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| trait CallGenerator { | ||
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| def generate( | ||
| codeGenerator: CodeGenerator, | ||
| operands: Seq[GeneratedExpression]) | ||
| : GeneratedExpression | ||
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| } |
62 changes: 62 additions & 0 deletions
62
...k-table/src/main/scala/org/apache/flink/api/table/codegen/calls/MethodCallGenerator.scala
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,62 @@ | ||
| /* | ||
| * 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 | ||
| * | ||
| * https://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.flink.api.table.codegen.calls | ||
|
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| import java.lang.reflect.Method | ||
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| import org.apache.flink.api.common.typeinfo.TypeInformation | ||
| import org.apache.flink.api.table.codegen.CodeGenUtils._ | ||
| import org.apache.flink.api.table.codegen.{CodeGenerator, GeneratedExpression} | ||
|
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| class MethodCallGenerator(returnType: TypeInformation[_], method: Method) extends CallGenerator { | ||
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| override def generate( | ||
| codeGenerator: CodeGenerator, | ||
| operands: Seq[GeneratedExpression]) | ||
| : GeneratedExpression = { | ||
| val resultTerm = newName("result") | ||
| val nullTerm = newName("isNull") | ||
| val resultTypeTerm = primitiveTypeTermForTypeInfo(returnType) | ||
| val defaultValue = primitiveDefaultValue(returnType) | ||
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| val resultCode = if (codeGenerator.nullCheck) { | ||
| s""" | ||
| |${operands.map(_.code).mkString("\n")} | ||
| |boolean $nullTerm = ${operands.map(_.nullTerm).mkString(" || ")}; | ||
| |$resultTypeTerm $resultTerm; | ||
| |if ($nullTerm) { | ||
| | $resultTerm = $defaultValue; | ||
| |} | ||
| |else { | ||
| | $resultTerm = ${method.getDeclaringClass.getCanonicalName}.${method.getName}( | ||
| | ${operands.map(_.resultTerm).mkString(", ")}); | ||
| |} | ||
| |""".stripMargin | ||
| } | ||
| else { | ||
| s""" | ||
| |${operands.map(_.code).mkString("\n")} | ||
| |$resultTypeTerm $resultTerm = ${method.getDeclaringClass.getCanonicalName}. | ||
| | ${method.getName}(${operands.map(_.resultTerm).mkString(", ")}); | ||
| |""".stripMargin | ||
| } | ||
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| GeneratedExpression(resultTerm, nullTerm, resultCode, returnType) | ||
| } | ||
| } |
72 changes: 72 additions & 0 deletions
72
...flink-table/src/main/scala/org/apache/flink/api/table/codegen/calls/ScalarFunctions.scala
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,72 @@ | ||
| /* | ||
| * 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 | ||
| * | ||
| * https://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.flink.api.table.codegen.calls | ||
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| import java.lang.reflect.Method | ||
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| import org.apache.calcite.sql.SqlOperator | ||
| import org.apache.calcite.sql.fun.SqlStdOperatorTable._ | ||
| import org.apache.calcite.util.BuiltInMethod | ||
| import org.apache.flink.api.common.typeinfo.BasicTypeInfo._ | ||
| import org.apache.flink.api.common.typeinfo.TypeInformation | ||
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| import scala.collection.mutable | ||
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| /** | ||
| * Global registry of built-in advanced SQL scalar functions. | ||
| */ | ||
| object ScalarFunctions { | ||
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| private val sqlFunctions: mutable.Map[(SqlOperator, Seq[TypeInformation[_]]), CallGenerator] = | ||
| mutable.Map() | ||
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| // ---------------------------------------------------------------------------------------------- | ||
| addSqlFunctionMethod( | ||
| SUBSTRING, | ||
| Seq(STRING_TYPE_INFO, INT_TYPE_INFO, INT_TYPE_INFO), | ||
| STRING_TYPE_INFO, | ||
| BuiltInMethod.SUBSTRING.method) | ||
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| addSqlFunctionMethod( | ||
| SUBSTRING, | ||
| Seq(STRING_TYPE_INFO, INT_TYPE_INFO), | ||
| STRING_TYPE_INFO, | ||
| BuiltInMethod.SUBSTRING.method) | ||
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| // ---------------------------------------------------------------------------------------------- | ||
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| def getCallGenerator( | ||
| call: SqlOperator, | ||
| operandTypes: Seq[TypeInformation[_]]) | ||
| : Option[CallGenerator] = { | ||
| sqlFunctions.get((call, operandTypes)) | ||
| } | ||
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| // ---------------------------------------------------------------------------------------------- | ||
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| private def addSqlFunctionMethod( | ||
| sqlOperator: SqlOperator, | ||
| operandTypes: Seq[TypeInformation[_]], | ||
| returnType: TypeInformation[_], | ||
| method: Method) | ||
| : Unit = { | ||
| sqlFunctions((sqlOperator, operandTypes)) = new MethodCallGenerator(returnType, method) | ||
| } | ||
|
|
||
| } |
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