CastDecimalInt.java example

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drill-master
/**
 * 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 />


<#list cast.types as type>

<#if type.major == "DecimalSimpleInt" || type.major == "DecimalSimpleBigInt"> <#-- Cast function template for conversion from Decimal9, Decimal18 to Int and BigInt -->

<@pp.changeOutputFile name="/org/apache/drill/exec/expr/fn/impl/gcast/Cast${type.from}${type.to}.java" />

<#include "/@includes/license.ftl" />

package org.apache.drill.exec.expr.fn.impl.gcast;

<#include "/@includes/vv_imports.ftl" />

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 org.apache.drill.exec.util.DecimalUtility;
import org.apache.drill.exec.expr.annotations.Workspace;
import io.netty.buffer.ByteBuf;
import java.nio.ByteBuffer;

/*
 * This class is generated using freemarker and the ${.template_name} template.
 */
@SuppressWarnings("unused")
@FunctionTemplate(name = "cast${type.to?upper_case}", scope = FunctionTemplate.FunctionScope.SIMPLE, nulls=NullHandling.NULL_IF_NULL)
public class Cast${type.from}${type.to} implements DrillSimpleFunc {

@Param ${type.from}Holder in;
@Output ${type.to}Holder out;

    public void setup() {
    }

    public void eval() {

        int carry = (org.apache.drill.exec.util.DecimalUtility.getFirstFractionalDigit(in.value, in.scale) > 4) ? 1 : 0;
        // Assign the integer part of the decimal to the output holder
        out.value = java.lang.Math.abs((${type.javatype}) (org.apache.drill.exec.util.DecimalUtility.adjustScaleDivide(in.value, (int) in.scale))) + carry;
        if (in.value < 0) {
          out.value *= -1;
        }
    }
}

<#elseif type.major == "DecimalComplexInt" || type.major == "DecimalComplexBigInt"> <#-- Cast function template for conversion from Decimal28Sparse, Decimal38Sparse to Int and BigInt -->
<@pp.changeOutputFile name="/org/apache/drill/exec/expr/fn/impl/gcast/Cast${type.from}${type.to}.java" />

<#include "/@includes/license.ftl" />

package org.apache.drill.exec.expr.fn.impl.gcast;

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 org.apache.drill.exec.util.DecimalUtility;
import org.apache.drill.exec.expr.annotations.Workspace;
import io.netty.buffer.ByteBuf;
import java.nio.ByteBuffer;

/*
 * This class is generated using freemarker and the ${.template_name} template.
 */

@SuppressWarnings("unused")
@FunctionTemplate(name = "cast${type.to?upper_case}", scope = FunctionTemplate.FunctionScope.SIMPLE, nulls=NullHandling.NULL_IF_NULL)
public class Cast${type.from}${type.to} implements DrillSimpleFunc {

@Param ${type.from}Holder in;
@Output ${type.to}Holder out;

    public void setup() {
    }

    public void eval() {

        int carry = (org.apache.drill.exec.util.DecimalUtility.getFirstFractionalDigit(in.buffer, in.scale, in.start, in.nDecimalDigits) > 4) ? 1 : 0;

        // Get the index, where the integer part of the decimal ends
        int integerEndIndex = in.nDecimalDigits - org.apache.drill.exec.util.DecimalUtility.roundUp(in.scale);

        for (int i = 0 ; i < integerEndIndex; i++) {
            // We store values as base 1 billion integers, use this to compute the output (we don't care about overflows)
            out.value = (${type.javatype}) ((out.value * org.apache.drill.exec.util.DecimalUtility.DIGITS_BASE) + in.getInteger(i, in.start, in.buffer));
        }

        out.value += carry;

        if (in.getSign(in.start, in.buffer) == true) {
            out.value *= -1;
        }
    }
}

</#if> <#-- type.major -->
</#list>