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https://issues.apache.org/jira/browse/ASTERIXDB-3101?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Ian Maxon resolved ASTERIXDB-3101.
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Resolution: Fixed
> Long query compilation due to pushing down assign operators unnecessarily
> -------------------------------------------------------------------------
>
> Key: ASTERIXDB-3101
> URL: https://issues.apache.org/jira/browse/ASTERIXDB-3101
> Project: Apache AsterixDB
> Issue Type: Bug
> Components: COMP - Compiler
> Affects Versions: 0.9.8
> Reporter: Ali Alsuliman
> Assignee: Ali Alsuliman
> Priority: Major
> Fix For: 0.9.8.1
>
>
> One of the things that PushFieldAccessRule attempts to do is push an assign
> operator down as close as possible to the respective data scan operator. In
> the case where all the operators below the assign are other assign operators
> and they are all just field accesses to the data scan, pushing down the
> assign through each individual operator is not necessary which was shown to
> be problematic when the SELECT statement has a large number of fields causing
> the compilation of the query to take eternity. Instead, the assign operator
> could skip the intermediate assign operators and be connected to the data
> scan.
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