jcamachor commented on a change in pull request #787: HIVE-22239
URL: https://github.com/apache/hive/pull/787#discussion_r332736102
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File path: ql/src/java/org/apache/hadoop/hive/ql/stats/StatsUtils.java
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@@ -935,8 +942,11 @@ else
if(colTypeLowerCase.equals(serdeConstants.SMALLINT_TYPE_NAME)){
cs.setNumTrues(Math.max(1, numRows/2));
cs.setNumFalses(Math.max(1, numRows/2));
cs.setAvgColLen(JavaDataModel.get().primitive1());
- } else if (colTypeLowerCase.equals(serdeConstants.TIMESTAMP_TYPE_NAME) ||
- colTypeLowerCase.equals(serdeConstants.TIMESTAMPLOCALTZ_TYPE_NAME)) {
+ } else if (colTypeLowerCase.equals(serdeConstants.TIMESTAMP_TYPE_NAME)) {
+ cs.setAvgColLen(JavaDataModel.get().lengthOfTimestamp());
+ // epoch, seconds since epoch
+ cs.setRange(0, 2177452799L);
Review comment:
I do not think this is critical, but I explored a bit and this seems to be a
poor choice for a heuristic, since in most cases it will lead to
underestimation of the data size (since most users will not have dates starting
from 1970).
I will take as lower limit `01-01-2015` (epoch for ORC) and as upper limit
`12-31-2024`. Let me know if you see any cons with this approach.
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