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https://issues.apache.org/jira/browse/HIVE-13685?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Gopal V updated HIVE-13685:
---------------------------
Status: Patch Available (was: Open)
> Vectorization: Date*ColScalar parses the scalar in every loop
> -------------------------------------------------------------
>
> Key: HIVE-13685
> URL: https://issues.apache.org/jira/browse/HIVE-13685
> Project: Hive
> Issue Type: Improvement
> Components: Vectorization
> Affects Versions: 2.1.0
> Reporter: Gopal V
> Assignee: Gopal V
> Attachments: HIVE-13685.1.patch, HIVE-13685.2.patch,
> HIVE-13685.WIP.patch
>
>
> {code}
> @Override
> public void evaluate(VectorizedRowBatch batch) {
> ...
> switch (inputTypes[0]) {
> ...
> case STRING:
> case CHAR:
> case VARCHAR:
> try {
> baseDate = formatter.parse(new String(stringValue, "UTF-8"));
> break;
> {code}
> This is parsing the constant scalar for every evaluate() call.
> Parsing the constant in the initialize op will save thousands of expensive
> calls into Calendar operations.
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