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DRILL-1874: Support casting empty string to null numeric based on con…
…figuration parameter
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85 changes: 85 additions & 0 deletions
85
exec/java-exec/src/main/codegen/templates/CastVarCharToNullableNumeric.java
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,85 @@ | ||
| /** | ||
| * 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. | ||
| */ | ||
| <@pp.dropOutputFile /> | ||
|
|
||
| <#macro doError> | ||
| { | ||
| byte[] buf = new byte[in.end - in.start]; | ||
| in.buffer.getBytes(in.start, buf, 0, in.end - in.start); | ||
| throw new NumberFormatException(new String(buf, com.google.common.base.Charsets.UTF_8)); | ||
| } | ||
| </#macro> | ||
|
|
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| <#list cast.types as type> | ||
| <#if type.major == "EmptyString"> | ||
|
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| <@pp.changeOutputFile name="/org/apache/drill/exec/expr/fn/impl/gcast/CastEmptyString${type.from}ToNullable${type.to}.java" /> | ||
|
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| <#include "/@includes/license.ftl" /> | ||
|
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| package org.apache.drill.exec.expr.fn.impl.gcast; | ||
|
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| import org.apache.drill.exec.expr.DrillSimpleFunc; | ||
| import org.apache.drill.exec.expr.annotations.FunctionTemplate; | ||
| import org.apache.drill.exec.expr.annotations.FunctionTemplate.NullHandling; | ||
| import org.apache.drill.exec.expr.annotations.Output; | ||
| import org.apache.drill.exec.expr.annotations.Param; | ||
| import org.apache.drill.exec.expr.holders.*; | ||
| import org.apache.drill.exec.record.RecordBatch; | ||
| import javax.inject.Inject; | ||
| import io.netty.buffer.DrillBuf; | ||
|
|
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| @SuppressWarnings("unused") | ||
| @FunctionTemplate(name = "castEmptyString${type.from}ToNullable${type.to?upper_case}", scope = FunctionTemplate.FunctionScope.SIMPLE, nulls=NullHandling.INTERNAL) | ||
| public class CastEmptyString${type.from}ToNullable${type.to} implements DrillSimpleFunc{ | ||
|
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| @Param ${type.from}Holder in; | ||
| @Output Nullable${type.to}Holder out; | ||
|
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| public void setup(RecordBatch incoming) {} | ||
|
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| public void eval() { | ||
| <#if type.to == "Float4" || type.to == "Float8"> | ||
| if(<#if type.from == "NullableVarChar"> in.isSet == 0 || </#if> in.end == in.start) { | ||
| out.isSet = 0; | ||
| } else{ | ||
| out.isSet = 1; | ||
| byte[]buf=new byte[in.end-in.start]; | ||
| in.buffer.getBytes(in.start,buf,0,in.end-in.start); | ||
| out.value=${type.javaType}.parse${type.parse}(new String(buf,com.google.common.base.Charsets.UTF_8)); | ||
| } | ||
| <#elseif type.to=="Int"> | ||
| if(<#if type.from == "NullableVarChar"> in.isSet == 0 || </#if> in.end == in.start) { | ||
| out.isSet = 0; | ||
| } else { | ||
| out.isSet = 1; | ||
| out.value = org.apache.drill.exec.expr.fn.impl.StringFunctionHelpers.varCharToInt(in.start, in.end, in.buffer); | ||
| } | ||
| <#elseif type.to == "BigInt"> | ||
| if(<#if type.from == "NullableVarChar"> in.isSet == 0 || </#if> in.end == in.start) { | ||
| out.isSet = 0; | ||
| } else { | ||
| out.isSet = 1; | ||
| out.value = org.apache.drill.exec.expr.fn.impl.StringFunctionHelpers.varCharToLong(in.start, in.end, in.buffer); | ||
| } | ||
| </#if> | ||
| } | ||
| } | ||
|
|
||
| </#if> <#-- type.major --> | ||
| </#list> |
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