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https://issues.apache.org/jira/browse/HIVE-4235?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Gang Tim Liu updated HIVE-4235:
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Attachment: HIVE-4235.patch.1
> CREATE TABLE IF NOT EXISTS uses inefficient way to check if table exists
> ------------------------------------------------------------------------
>
> Key: HIVE-4235
> URL: https://issues.apache.org/jira/browse/HIVE-4235
> Project: Hive
> Issue Type: Bug
> Components: JDBC, Query Processor, SQL
> Reporter: Gang Tim Liu
> Assignee: Gang Tim Liu
> Attachments: HIVE-4235.patch.1
>
>
> CREATE TABLE IF NOT EXISTS uses inefficient way to check if table exists.
> It uses Hive.java's getTablesByPattern(...) to check if table exists. It
> involves regular expression and eventually database join. Very efficient. It
> can cause database lock time increase and hurt db performance if a lot of
> such commands hit database.
> The suggested approach is to use getTable(...) since we know tablename already
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