You are viewing a plain text version of this content. The canonical link for it is here.
Posted to commits@impala.apache.org by ta...@apache.org on 2018/04/25 06:15:12 UTC
[2/4] impala git commit: IMPALA-6912: [DOCS] A new query option
COMPUTE_STATS_MIN_SAMPLE_SIZE
IMPALA-6912: [DOCS] A new query option COMPUTE_STATS_MIN_SAMPLE_SIZE
Change-Id: Ibd6f55a4c6c99185baf7974f68935ba4e03579df
Reviewed-on: http://gerrit.cloudera.org:8080/10172
Reviewed-by: Alex Behm <al...@cloudera.com>
Tested-by: Impala Public Jenkins <im...@cloudera.com>
Project: http://git-wip-us.apache.org/repos/asf/impala/repo
Commit: http://git-wip-us.apache.org/repos/asf/impala/commit/766766f6
Tree: http://git-wip-us.apache.org/repos/asf/impala/tree/766766f6
Diff: http://git-wip-us.apache.org/repos/asf/impala/diff/766766f6
Branch: refs/heads/2.x
Commit: 766766f6958265f36204324cd1d0ec5fa57cb5a5
Parents: 69fb71d
Author: Alex Rodoni <ar...@cloudera.com>
Authored: Mon Apr 23 22:10:53 2018 -0700
Committer: Impala Public Jenkins <im...@gerrit.cloudera.org>
Committed: Wed Apr 25 02:10:17 2018 +0000
----------------------------------------------------------------------
docs/impala.ditamap | 1 +
docs/impala_keydefs.ditamap | 1 +
.../impala_compute_stats_min_sample_size.xml | 47 ++++++++++++++++++++
3 files changed, 49 insertions(+)
----------------------------------------------------------------------
http://git-wip-us.apache.org/repos/asf/impala/blob/766766f6/docs/impala.ditamap
----------------------------------------------------------------------
diff --git a/docs/impala.ditamap b/docs/impala.ditamap
index ec6d313..d9658ec 100644
--- a/docs/impala.ditamap
+++ b/docs/impala.ditamap
@@ -176,6 +176,7 @@ under the License.
<topicref href="topics/impala_batch_size.xml"/>
<topicref rev="2.10.0 IMPALA-3200" href="topics/impala_buffer_pool_limit.xml"/>
<topicref href="topics/impala_compression_codec.xml"/>
+ <topicref href="topics/impala_compute_stats_min_sample_size.xml"/>
<topicref href="topics/impala_debug_action.xml"/>
<topicref rev="2.9.0" href="topics/impala_decimal_v2.xml"/>
<topicref rev="2.9.0 IMPALA-5381" href="topics/impala_default_join_distribution_mode.xml"/>
http://git-wip-us.apache.org/repos/asf/impala/blob/766766f6/docs/impala_keydefs.ditamap
----------------------------------------------------------------------
diff --git a/docs/impala_keydefs.ditamap b/docs/impala_keydefs.ditamap
index d9eb62d..eda2282 100644
--- a/docs/impala_keydefs.ditamap
+++ b/docs/impala_keydefs.ditamap
@@ -10777,6 +10777,7 @@ under the License.
<keydef href="topics/impala_batch_size.xml" keys="batch_size"/>
<keydef rev="2.10.0 IMPALA-3200" href="topics/impala_buffer_pool_limit.xml" keys="buffer_pool_limit"/>
<keydef href="topics/impala_compression_codec.xml" keys="compression_codec"/>
+ <keydef href="topics/impala_compute_stats_min_sample_size.xml" keys="comute_stats_min_sample_size"/>
<keydef href="topics/impala_debug_action.xml" keys="debug_action"/>
<keydef href="topics/impala_default_join_distribution_mode.xml" keys="default_join_distribution_mode"/>
<keydef href="topics/impala_default_order_by_limit.xml" keys="default_order_by_limit"/>
http://git-wip-us.apache.org/repos/asf/impala/blob/766766f6/docs/topics/impala_compute_stats_min_sample_size.xml
----------------------------------------------------------------------
diff --git a/docs/topics/impala_compute_stats_min_sample_size.xml b/docs/topics/impala_compute_stats_min_sample_size.xml
new file mode 100644
index 0000000..bf29058
--- /dev/null
+++ b/docs/topics/impala_compute_stats_min_sample_size.xml
@@ -0,0 +1,47 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<!--
+Licensed to the Apache Software Foundation (ASF) under one
+or more contributor license agreements. See the NOTICE file
+distributed with this work for additional information
+regarding copyright ownership. The ASF licenses this file
+to you under the Apache License, Version 2.0 (the
+"License"); you may not use this file except in compliance
+with the License. You may obtain a copy of the License at
+
+ http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing,
+software distributed under the License is distributed on an
+"AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+KIND, either express or implied. See the License for the
+specific language governing permissions and limitations
+under the License.
+-->
+<!DOCTYPE concept PUBLIC "-//OASIS//DTD DITA Concept//EN" "concept.dtd">
+<concept id="compute_stats_sample_min_sample_size" rev="2.12.0">
+ <title>COMPUTE_STATS_MIN_SAMPLE_SIZE Query Option</title>
+ <titlealts audience="PDF">
+ <navtitle>COMPUTE_STATS_MIN_SAMPLE_SIZE</navtitle>
+ </titlealts>
+ <prolog>
+ <metadata>
+ <data name="Category" value="Impala"/>
+ <data name="Category" value="Impala Query Options"/>
+ <data name="Category" value="Querying"/>
+ <data name="Category" value="Developers"/>
+ <data name="Category" value="Data Analysts"/>
+ </metadata>
+ </prolog>
+ <conbody>
+ <p>The <codeph>COMPUTE_STATS_MIN_SAMPLE_SIZE</codeph> query option specifies
+ the minimum number of bytes that will be scanned in <codeph>COMPUTE STATS
+ TABLESAMPLE</codeph>, regardless of the user-supplied sampling percent.
+ This query option prevents sampling for very small tables where accurate
+ stats can be obtained cheaply without sampling because the minimum sample
+ size is required to get meaningful stats.</p>
+ <p conref="../shared/impala_common.xml#common/type_integer"/>
+ <p><b>Default:</b> 1GB</p>
+ <p><b>Added in</b>: <keyword keyref="impala212_full"/></p>
+ <p conref="../shared/impala_common.xml#common/usage_notes_blurb"/>
+ </conbody>
+</concept>