[spark] branch branch-3.0 updated: [MINOR][SQL][DOCS] Fix some wrong default values in SQL tuning guide's AQE section

[gurwls223]

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The following commit(s) were added to refs/heads/branch-3.0 by this push:
     new e2455c5  [MINOR][SQL][DOCS] Fix some wrong default values in SQL 
tuning guide's AQE section
e2455c5 is described below

commit e2455c5270a518aa92af9b9c5ff0e44889d2a737
Author: Kent Yao <y...@apache.org>
AuthorDate: Wed Mar 3 15:00:09 2021 +0900

    [MINOR][SQL][DOCS] Fix some wrong default values in SQL tuning guide's AQE 
section
    
    ### What changes were proposed in this pull request?
    
    spark.sql.adaptive.coalescePartitions.initialPartitionNum 200 -> (none)
    spark.sql.adaptive.skewJoin.skewedPartitionFactor is 10 -> 5
    
    ### Why are the changes needed?
    
    the wrong doc misguide people
    ### Does this PR introduce _any_ user-facing change?
    
    no
    
    ### How was this patch tested?
    
    passing doc
    
    Closes #31717 from yaooqinn/minordoc0.
    
    Authored-by: Kent Yao <y...@apache.org>
    Signed-off-by: HyukjinKwon <gurwls...@apache.org>
    (cherry picked from commit 499f6200371e9ef33f7f1efba9836e42a7e1b89b)
    Signed-off-by: HyukjinKwon <gurwls...@apache.org>
---
 docs/sql-performance-tuning.md                                      | 6 +++---
 .../src/main/scala/org/apache/spark/sql/internal/SQLConf.scala      | 2 +-
 .../apache/spark/sql/execution/adaptive/OptimizeSkewedJoin.scala    | 4 ++--
 3 files changed, 6 insertions(+), 6 deletions(-)

diff --git a/docs/sql-performance-tuning.md b/docs/sql-performance-tuning.md
index 49b32e7..192e925 100644
--- a/docs/sql-performance-tuning.md
+++ b/docs/sql-performance-tuning.md
@@ -245,9 +245,9 @@ This feature coalesces the post shuffle partitions based on 
the map output stati
    </tr>
    <tr>
      
<td><code>spark.sql.adaptive.coalescePartitions.initialPartitionNum</code></td>
-     <td>200</td>
+     <td>(none)</td>
      <td>
-       The initial number of shuffle partitions before coalescing. By default 
it equals to <code>spark.sql.shuffle.partitions</code>. This configuration only 
has an effect when <code>spark.sql.adaptive.enabled</code> and 
<code>spark.sql.adaptive.coalescePartitions.enabled</code> are both enabled.
+       The initial number of shuffle partitions before coalescing. If not set, 
it equals to <code>spark.sql.shuffle.partitions</code>. This configuration only 
has an effect when <code>spark.sql.adaptive.enabled</code> and 
<code>spark.sql.adaptive.coalescePartitions.enabled</code> are both enabled.
      </td>
      <td>3.0.0</td>
    </tr>
@@ -278,7 +278,7 @@ Data skew can severely downgrade the performance of join 
queries. This feature d
      </tr>
      <tr>
        <td><code>spark.sql.adaptive.skewJoin.skewedPartitionFactor</code></td>
-       <td>10</td>
+       <td>5</td>
        <td>
          A partition is considered as skewed if its size is larger than this 
factor multiplying the median partition size and also larger than 
<code>spark.sql.adaptive.skewJoin.skewedPartitionThresholdInBytes</code>.
        </td>
diff --git 
a/sql/catalyst/src/main/scala/org/apache/spark/sql/internal/SQLConf.scala 
b/sql/catalyst/src/main/scala/org/apache/spark/sql/internal/SQLConf.scala
index a2aa6f8..85ac7b8 100644
--- a/sql/catalyst/src/main/scala/org/apache/spark/sql/internal/SQLConf.scala
+++ b/sql/catalyst/src/main/scala/org/apache/spark/sql/internal/SQLConf.scala
@@ -447,7 +447,7 @@ object SQLConf {
 
   val COALESCE_PARTITIONS_INITIAL_PARTITION_NUM =
     buildConf("spark.sql.adaptive.coalescePartitions.initialPartitionNum")
-      .doc("The initial number of shuffle partitions before coalescing. By 
default it equals to " +
+      .doc("The initial number of shuffle partitions before coalescing. If not 
set, it equals to " +
         s"${SHUFFLE_PARTITIONS.key}. This configuration only has an effect 
when " +
         s"'${ADAPTIVE_EXECUTION_ENABLED.key}' and 
'${COALESCE_PARTITIONS_ENABLED.key}' " +
         "are both true.")
diff --git 
a/sql/core/src/main/scala/org/apache/spark/sql/execution/adaptive/OptimizeSkewedJoin.scala
 
b/sql/core/src/main/scala/org/apache/spark/sql/execution/adaptive/OptimizeSkewedJoin.scala
index b3b3eb2..8dcbad1 100644
--- 
a/sql/core/src/main/scala/org/apache/spark/sql/execution/adaptive/OptimizeSkewedJoin.scala
+++ 
b/sql/core/src/main/scala/org/apache/spark/sql/execution/adaptive/OptimizeSkewedJoin.scala
@@ -62,8 +62,8 @@ case class OptimizeSkewedJoin(conf: SQLConf) extends 
Rule[SparkPlan] {
 
   /**
    * A partition is considered as a skewed partition if its size is larger 
than the median
-   * partition size * ADAPTIVE_EXECUTION_SKEWED_PARTITION_FACTOR and also 
larger than
-   * ADVISORY_PARTITION_SIZE_IN_BYTES.
+   * partition size * SKEW_JOIN_SKEWED_PARTITION_FACTOR and also larger than
+   * SKEW_JOIN_SKEWED_PARTITION_THRESHOLD.
    */
   private def isSkewed(size: Long, medianSize: Long): Boolean = {
     size > medianSize * 
conf.getConf(SQLConf.SKEW_JOIN_SKEWED_PARTITION_FACTOR) &&


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