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https://issues.apache.org/jira/browse/IMPALA-10985?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Csaba Ringhofer updated IMPALA-10985:
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Description: IMPALA-10314 added always_true hint that leads to assuming
that a file in a table will return at least one row even if there is a WHERE
clause. Currently we need to add it even if all columns used in the WHERE are
partitioning columns. This is not needed, as these predicates can't drop any
more rows after partition pruning. (was: IMPALA-10314 added always_true hint
that leads to assuming that a file in a table will return at least on row even
if there is a WHERE clause. Currently we need to add it even if all columns
used in the WHERE are partitioning columns. This is not needed, as these
predicates can't drop any more rows after partition pruning.)
> always_true hint is not needed if all predicates are on partitioning columns
> ----------------------------------------------------------------------------
>
> Key: IMPALA-10985
> URL: https://issues.apache.org/jira/browse/IMPALA-10985
> Project: IMPALA
> Issue Type: Improvement
> Reporter: Csaba Ringhofer
> Priority: Minor
>
> IMPALA-10314 added always_true hint that leads to assuming that a file in a
> table will return at least one row even if there is a WHERE clause. Currently
> we need to add it even if all columns used in the WHERE are partitioning
> columns. This is not needed, as these predicates can't drop any more rows
> after partition pruning.
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