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naisila 2023-10-23 12:40:10 +03:00 committed by Naisila Puka
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src/backend/distributed/README.md
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@ -1281,8 +1281,7 @@ Correlated or LATERAL subqueries have special behavior in Citus. They can often
**Key Code Details**:
For more information on the code, check the following functions:
`DeferErrorIfCannotPushdownSubquery()` ->
`ContainsReferencesToOuterQuery()` ->
`DeferredErrorIfUnsupportedLateralSubquery()`.
`ContainsReferencesToOuterQuery()`, `DeferErrorIfSubqueryRequiresMerge()`, `DeferredErrorIfUnsupportedLateralSubquery()`. LATERAL queries are different/unique: even if the subquery requires a merge step such as a `LIMIT`, if the correlation is on the distribution column, we can push it down. See [#4385](https://github.com/citusdata/citus/pull/4385).