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https://issues.apache.org/jira/browse/HAWQ-964?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Shivram Mani reassigned HAWQ-964:
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Assignee: Shivram Mani (was: Goden Yao)
> Support for additional logical operators in PXF
> -----------------------------------------------
>
> Key: HAWQ-964
> URL: https://issues.apache.org/jira/browse/HAWQ-964
> Project: Apache HAWQ
> Issue Type: Improvement
> Components: PXF
> Reporter: Shivram Mani
> Assignee: Shivram Mani
> Fix For: backlog
>
>
> Currently the extension framework only allows the 'AND' logical operator
> across the provided predicates. Will need to support other logical operators
> such as 'OR' 'NOT'
> Logical operators (such as AND, OR, NOT) will be denoted by the letter 'l'
> Comparison operators (such as <, >, = etc) will be denoted by 'o'
> Constants by 'c'
> Variables (column index) by 'a'
> Have a separate enum for logical operators say PxfLogicalOperatorCode and
> include AND,OR,NOT in it.
> Other logical operators can continue existing in PxfOperatorCode enum.
> Change the way Qualifier tree is handled to take care of precedence. in
> pxffilters.c.
> The output of this should produce a postfix notation.
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