Yiqun Zhang created ORC-992:
-------------------------------
Summary: Reached max repeat length, we can directly decide to use
DELTA encoding
Key: ORC-992
URL: https://issues.apache.org/jira/browse/ORC-992
Project: ORC
Issue Type: Improvement
Components: Java
Affects Versions: 1.7.0
Reporter: Yiqun Zhang
Fix For: 1.7.0
Reached max repeat length, we can directly decide to use DELTA encoding.
RunLengthIntegerWriterV2.java 756-760
{code:java}
// if fixed runs reached max repeat length then write values
if (fixedRunLength == MAX_SCOPE) {
determineEncoding();
writeValues();
}
{code}
If fixed runs reached max repeat length. We have been able to determine the use
of the DELTA code, fixedDelta is zero.
The computeZigZagLiterals, zzBits100p, and determine isFixedDelta within the
determineEncoding method are all redundant in the current case.
Similar practices.
RunLengthIntegerWriterV2.java 767-775
{code:java}
if (fixedRunLength >= MIN_REPEAT) {
if (fixedRunLength <= MAX_SHORT_REPEAT_LENGTH) {
encoding = EncodingType.SHORT_REPEAT;
} else {
encoding = EncodingType.DELTA;
isFixedDelta = true;
}
writeValues();
}
{code}
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