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https://issues.apache.org/jira/browse/HIVE-15670?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16217948#comment-16217948
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Sergey Shelukhin commented on HIVE-15670:
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Beats me... the current implementation is as such.
> column_stats_accurate may not fit in PARTITION_PARAMS.VALUE
> -----------------------------------------------------------
>
> Key: HIVE-15670
> URL: https://issues.apache.org/jira/browse/HIVE-15670
> Project: Hive
> Issue Type: Bug
> Reporter: Sergey Shelukhin
>
> The JSON can be too big with many columns (see setColumnStatsState method).
> We can make JSON more compact by only storing the list of columns with true
> values. Or we can even store a bitmask in a dedicated column, and adjust it
> when altering table (rare enough). Or we can just change the VALUE column to
> text blob (might be a painful change wrt upgrade scripts, and supporting all
> the DBs' varied blob implementations, esp. in directsql).
> Storing denormalized flags in a separate table will probably be slow,
> comparatively.
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