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wenchen pushed a commit to branch branch-3.0
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The following commit(s) were added to refs/heads/branch-3.0 by this push:
new 49855e7 [SPARK-32095][SQL] Update documentation to reflect usage of
updated statistics
49855e7 is described below
commit 49855e78a3ae430cd67c50d6dd81f6688fb3de15
Author: Micah Kornfield <mic...@google.com>
AuthorDate: Wed Jul 1 07:13:10 2020 +0000
[SPARK-32095][SQL] Update documentation to reflect usage of updated
statistics
### What changes were proposed in this pull request?
Update documentation to reflect changes in
https://github.com/apache/spark/commit/faf220aad9051c224a630e678c54098861f6b482
I've changed the documentation to reflect updated statistics may be used to
improve query plan.
### Why are the changes needed?
I believe the documentation is stale and misleading.
### Does this PR introduce _any_ user-facing change?
Yes, this is a javadoc documentation fix.
### How was this patch tested?
Doc fix.
Closes #28925 from emkornfield/spark-32095.
Authored-by: Micah Kornfield <mic...@google.com>
Signed-off-by: Wenchen Fan <wenc...@databricks.com>
(cherry picked from commit a4ba34434c55c7f0eafa32d8c7ea6e052813f293)
Signed-off-by: Wenchen Fan <wenc...@databricks.com>
---
.../apache/spark/sql/connector/read/SupportsReportStatistics.java | 6 +++---
1 file changed, 3 insertions(+), 3 deletions(-)
diff --git
a/sql/catalyst/src/main/java/org/apache/spark/sql/connector/read/SupportsReportStatistics.java
b/sql/catalyst/src/main/java/org/apache/spark/sql/connector/read/SupportsReportStatistics.java
index b839fd5..1e0c9ca 100644
---
a/sql/catalyst/src/main/java/org/apache/spark/sql/connector/read/SupportsReportStatistics.java
+++
b/sql/catalyst/src/main/java/org/apache/spark/sql/connector/read/SupportsReportStatistics.java
@@ -23,9 +23,9 @@ import org.apache.spark.annotation.Evolving;
* A mix in interface for {@link Scan}. Data sources can implement this
interface to
* report statistics to Spark.
*
- * As of Spark 2.4, statistics are reported to the optimizer before any
operator is pushed to the
- * data source. Implementations that return more accurate statistics based on
pushed operators will
- * not improve query performance until the planner can push operators before
getting stats.
+ * As of Spark 3.0, statistics are reported to the optimizer after operators
are pushed to the
+ * data source. Implementations may return more accurate statistics based on
pushed operators
+ * which may improve query performance by providing better information to the
optimizer.
*
* @since 3.0.0
*/
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