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docs: blurb about msq union all #15223

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Oct 31, 2023
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docs: blurb about msq union all #15223

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docs: blurb about msq union all' && git push
317brian Oct 20, 2023
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change list to paragraph
317brian Oct 25, 2023
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Merge branch 'master' into clarify-msq-union-all
317brian Oct 27, 2023
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Update docs/querying/sql.md
317brian Oct 27, 2023
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4 changes: 1 addition & 3 deletions docs/querying/sql.md
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Expand Up @@ -218,9 +218,7 @@ UNION ALL
SELECT COUNT(*) FROM tbl WHERE my_column = 'value2'
```

:::info
With top-level queries, you can't apply GROUP BY, ORDER BY, or any other operator to the results of a UNION ALL.
:::
When you use a top-level UNION ALL, there are certain limitations that apply. For all top-level UNION ALL queries, you can't apply a GROUP BY, ORDER BY, or any other operator to the results of the query. For any top-level UNION ALL that uses the MSQ task engine, the SQL planner attempts to plan the top-level UNION ALL as a table-level UNION ALL. Because of this, UNION ALL queries that use the MSQ task engine always behave the same as a table-level UNION ALL queries. They have the same characteristics and limitations. If the planner can't plan the query as a table-level UNION ALL, the query fails.
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### Table-level

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