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Posted to commits@druid.apache.org by GitBox <gi...@apache.org> on 2021/12/14 01:19:59 UTC
[GitHub] [druid] jon-wei commented on a change in pull request #12057: Document query context parameters related to join filters
jon-wei commented on a change in pull request #12057:
URL: https://github.com/apache/druid/pull/12057#discussion_r768244121
##########
File path: docs/querying/query-context.md
##########
@@ -79,6 +79,15 @@ In addition, some query types offer context parameters specific to that query ty
|-----------------|---------------------|----------------------|
|skipEmptyBuckets | `false` | Disable timeseries zero-filling behavior, so only buckets with results will be returned. |
+### Join filter
+
+|property |default | description |
+|-----------------|---------------------|----------------------|
+|enableJoinFilterPushDown | `true` | Controls whether a join query will attempt filter push down, which reduces the number of rows that have to be compared in a join operation.|
+|enableJoinFilterRewrite | `false` | Controls whether filter clauses that reference non-base table columns will be rewritten into filters on base table columns.|
Review comment:
`enableJoinFilterRewrite` defaults to `true` now
##########
File path: docs/querying/query-context.md
##########
@@ -79,6 +79,15 @@ In addition, some query types offer context parameters specific to that query ty
|-----------------|---------------------|----------------------|
|skipEmptyBuckets | `false` | Disable timeseries zero-filling behavior, so only buckets with results will be returned. |
+### Join filter
+
+|property |default | description |
+|-----------------|---------------------|----------------------|
+|enableJoinFilterPushDown | `true` | Controls whether a join query will attempt filter push down, which reduces the number of rows that have to be compared in a join operation.|
+|enableJoinFilterRewrite | `false` | Controls whether filter clauses that reference non-base table columns will be rewritten into filters on base table columns.|
+|enableJoinFilterRewriteValueColumnFilters | `false` | Controls whether Druid rewrites non-base table filters on non-key columns. Requires a scan of the non-base table.|
Review comment:
Suggest "Controls whether Druid rewrites non-base table filters on non-key columns in the non-base table. Requires a scan of the non-base table."
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