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https://issues.apache.org/jira/browse/CALCITE-2635?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16738613#comment-16738613
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Julian Hyde commented on CALCITE-2635:
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I have a $350 [Intel
NUC|https://www.amazon.com/gp/product/B01N2UMKZ5/ref=ppx_od_dt_b_detailpages00?ie=UTF8&psc=1]
in my home office. It is 99% idle. You're welcome to have ssh access.
> getMonotonocity is slow on wide tables
> --------------------------------------
>
> Key: CALCITE-2635
> URL: https://issues.apache.org/jira/browse/CALCITE-2635
> Project: Calcite
> Issue Type: Improvement
> Components: core
> Reporter: Gian Merlino
> Assignee: Gian Merlino
> Priority: Major
> Labels: performance
> Fix For: 1.19.0
>
>
> RelOptTableImpl's getMonotonocity does an indexOf on
> {{rowType.getFieldNames()}}, which is O(N) in the number of fields.
> IdentifierNamespace calls getMonotonicity once for every field in the table
> namespace, so it becomes O(N^2) in the number of fields. We observed 2-4
> second query planning times with a table that had 18,000 columns, reduced to
> about 150ms after patching getMonotonicity to be O(1) in the number of fields.
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