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https://issues.apache.org/jira/browse/ASTERIXDB-2511?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Dmitry Lychagin resolved ASTERIXDB-2511.
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Resolution: Fixed
> Refactor LET and WHERE clauses into a single clause list
> ---------------------------------------------------------
>
> Key: ASTERIXDB-2511
> URL: https://issues.apache.org/jira/browse/ASTERIXDB-2511
> Project: Apache AsterixDB
> Issue Type: Improvement
> Components: COMP - Compiler
> Reporter: Dmitry Lychagin
> Assignee: Dmitry Lychagin
> Priority: Minor
>
> Currently SelectBlock has a list of LET clauses followed by a single WHERE
> clause. Some expression tree rewriting rules (e.g. InlineColumnAliasVisitor)
> ** introduce LET clauses which can only be placed before the WHERE clause
> because of this design. This approach creates a problem when rewriting window
> expressions because they might need to be placed after the WHERE clause to
> maintain the correct semantics.
> The proposal is to consolidate LET/WHERE clauses into a single list in the
> SelectBlock, so LET clauses can be placed either before or after the WHERE
> clause. The SELECT statement syntax won't be changed at this point, so it'll
> continue to support only multiple LET clauses followed by a single WHERE
> clause.
> LET/HAVING clauses after GROUP BY clause will also be consolidated into a
> single list.
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