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[GH-3146] Optimize the binaryToDecimal function #3147

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[GH-3146] Optimize the binaryToDecimal function #3147

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8 changes: 1 addition & 7 deletions parquet-pig/src/main/java/org/apache/parquet/pig/convert/DecimalUtils.java
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Original file line number Diff line number Diff line change
Expand Up @@ -19,8 +19,6 @@

package org.apache.parquet.pig.convert;

import static java.lang.Math.pow;

import java.math.BigDecimal;
import java.math.BigInteger;
import java.nio.ByteBuffer;
Expand Down Expand Up @@ -53,11 +51,7 @@ public static BigDecimal binaryToDecimal(Binary value, int precision, int scale)
}
int bits = 8 * (end - start);
long unscaledNew = (unscaled << (64 - bits)) >> (64 - bits);
if (unscaledNew <= -pow(10, 18) || unscaledNew >= pow(10, 18)) {
return new BigDecimal(unscaledNew);
} else {
return BigDecimal.valueOf(unscaledNew / pow(10, scale));
}
return BigDecimal.valueOf(unscaledNew, scale);
} else {
return new BigDecimal(new BigInteger(value.getBytes()), scale);
}
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4 changes: 2 additions & 2 deletions parquet-pig/src/test/java/org/apache/parquet/pig/TestDecimalUtils.java
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Expand Up @@ -60,12 +60,12 @@ public void testBinaryToDecimal() throws Exception {
// Test LONG
testDecimalConversion(Long.MAX_VALUE, 19, 0, "9223372036854775807");
testDecimalConversion(Long.MIN_VALUE, 19, 0, "-9223372036854775808");
testDecimalConversion(0L, 0, 0, "0.0");
testDecimalConversion(0L, 0, 0, "0");
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Why do these two lines need change?

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@qian0817 qian0817 Feb 7, 2025 •
edited
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For this use case, 0 is the correct value. Using double to construct BigDecimal previously may lead to potential incorrect behavior.


// Test INTEGER
testDecimalConversion(Integer.MAX_VALUE, 10, 0, "2147483647");
testDecimalConversion(Integer.MIN_VALUE, 10, 0, "-2147483648");
testDecimalConversion(0, 0, 0, "0.0");
testDecimalConversion(0, 0, 0, "0");

// Test DOUBLE
testDecimalConversion(12345678912345678d, 17, 0, "12345678912345678");
Expand Down