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Short Description

A process is waiting for other parallel hash participants to finish partitioning the outer relation.

Additional Information

Seen in parallel hash execution plans waiting for the background worker processes to partition the outer (driven) table.

How to reduce this wait

No information is available here. Have you seen this wait? Let us know.

PostgreSQL documentation - Parallel Query

PostgreSQL documentation - The Statistics Collector

EDB - Parallel Hash Joins in PostgreSQL Explained

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