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new 04fd8f787d8 session vars used to control scanner (#1173)
04fd8f787d8 is described below
commit 04fd8f787d882c87e462d091842ec42f157e45b9
Author: zhiqiang <seuhezhiqi...@163.com>
AuthorDate: Wed Oct 16 23:22:23 2024 +0800
session vars used to control scanner (#1173)
# Versions
- [x] dev
- [x] 3.0
- [x] 2.1
- [ ] 2.0
# Languages
- [x] Chinese
- [x] English
https://github.com/apache/doris/pull/39927
---
docs/query/query-variables/variables.md | 9 +++++++++
.../current/query/query-variables/variables.md | 8 ++++++++
.../version-2.1/query/query-variables/variables.md | 8 ++++++++
.../version-3.0/query/query-variables/variables.md | 8 ++++++++
versioned_docs/version-2.1/query/query-variables/variables.md | 9 +++++++++
versioned_docs/version-3.0/query/query-variables/variables.md | 9 +++++++++
6 files changed, 51 insertions(+)
diff --git a/docs/query/query-variables/variables.md
b/docs/query/query-variables/variables.md
index 873741a9cd1..739cf4fd4f1 100644
--- a/docs/query/query-variables/variables.md
+++ b/docs/query/query-variables/variables.md
@@ -700,6 +700,15 @@ Optional values:
Controls whether to extend variant column in desc table_name. The default
value is false.
+* `enable_adaptive_pipeline_task_serial_read_on_limit`
+
+ When enabled, the pipeline task concurrency will be adjusted
automatically. When the scan node has no filter conditions and the limit
parameter is less than the number of rows specified in
`adaptive_pipeline_task_serial_read_on_limit`, the parallelism of the scan will
be set to 1.
+
+* `adaptive_pipeline_task_serial_read_on_limit`
+
+ When `enable_adaptive_pipeline_task_serial_read_on_limit` is enabled, the
number of rows at which the parallelism of the scan will be set to 1.
+ Default value is `10000`
+
***
#### Supplementary instructions on statement execution timeout control
diff --git
a/i18n/zh-CN/docusaurus-plugin-content-docs/current/query/query-variables/variables.md
b/i18n/zh-CN/docusaurus-plugin-content-docs/current/query/query-variables/variables.md
index fe952a6dec9..4c4808598fb 100644
---
a/i18n/zh-CN/docusaurus-plugin-content-docs/current/query/query-variables/variables.md
+++
b/i18n/zh-CN/docusaurus-plugin-content-docs/current/query/query-variables/variables.md
@@ -691,6 +691,14 @@ try (Connection conn =
DriverManager.getConnection("jdbc:mysql://127.0.0.1:9030/
是否展示 variant 的拆解列。默认为 false。
+* `enable_adaptive_pipeline_task_serial_read_on_limit`
+
+ 开启后将会允许自动调整 pipeline task 的并发数。当 scan 节点没有过滤条件，且 limit 参数小于
`adaptive_pipeline_task_serial_read_on_limit` 中指定的行数时，scan 的并行度将会被设置为 1。
+
+* `adaptive_pipeline_task_serial_read_on_limit`
+
+ 当 enable_adaptive_pipeline_task_serial_read_on_limit 开启时，scan 的并行度将会被设置为 1
的行数阈值。默认值是 `10000`。
+
***
#### 关于语句执行超时控制的补充说明
diff --git
a/i18n/zh-CN/docusaurus-plugin-content-docs/version-2.1/query/query-variables/variables.md
b/i18n/zh-CN/docusaurus-plugin-content-docs/version-2.1/query/query-variables/variables.md
index 631b7f1536b..f0dd96a103b 100644
---
a/i18n/zh-CN/docusaurus-plugin-content-docs/version-2.1/query/query-variables/variables.md
+++
b/i18n/zh-CN/docusaurus-plugin-content-docs/version-2.1/query/query-variables/variables.md
@@ -707,6 +707,14 @@ try (Connection conn =
DriverManager.getConnection("jdbc:mysql://127.0.0.1:9030/
是否展示 variant 的拆解列。默认为 false。
+* `enable_adaptive_pipeline_task_serial_read_on_limit`
+
+ 开启后将会允许自动调整 pipeline task 的并发数。当 scan 节点没有过滤条件，且 limit 参数小于
`adaptive_pipeline_task_serial_read_on_limit` 中指定的行数时，scan 的并行度将会被设置为 1。
+
+* `adaptive_pipeline_task_serial_read_on_limit`
+
+ 当 enable_adaptive_pipeline_task_serial_read_on_limit 开启时，scan 的并行度将会被设置为 1
的行数阈值。默认值是 `10000`。
+
***
#### 关于语句执行超时控制的补充说明
diff --git
a/i18n/zh-CN/docusaurus-plugin-content-docs/version-3.0/query/query-variables/variables.md
b/i18n/zh-CN/docusaurus-plugin-content-docs/version-3.0/query/query-variables/variables.md
index b11e2149dac..e8ad473a458 100644
---
a/i18n/zh-CN/docusaurus-plugin-content-docs/version-3.0/query/query-variables/variables.md
+++
b/i18n/zh-CN/docusaurus-plugin-content-docs/version-3.0/query/query-variables/variables.md
@@ -691,6 +691,14 @@ try (Connection conn =
DriverManager.getConnection("jdbc:mysql://127.0.0.1:9030/
是否展示 variant 的拆解列。默认为 false。
+* `enable_adaptive_pipeline_task_serial_read_on_limit`
+
+ 开启后将会允许自动调整 pipeline task 的并发数。当 scan 节点没有过滤条件，且 limit 参数小于
`adaptive_pipeline_task_serial_read_on_limit` 中指定的行数时，scan 的并行度将会被设置为 1。
+
+* `adaptive_pipeline_task_serial_read_on_limit`
+
+ 当 enable_adaptive_pipeline_task_serial_read_on_limit 开启时，scan 的并行度将会被设置为 1
的行数阈值。默认值是 `10000`。
+
***
#### 关于语句执行超时控制的补充说明
diff --git a/versioned_docs/version-2.1/query/query-variables/variables.md
b/versioned_docs/version-2.1/query/query-variables/variables.md
index 1a4c675f25a..0e5bc52e3d8 100644
--- a/versioned_docs/version-2.1/query/query-variables/variables.md
+++ b/versioned_docs/version-2.1/query/query-variables/variables.md
@@ -718,6 +718,15 @@ This feature is supported since the Apache Doris 2.0.2
version
Controls whether to extend variant column in desc table_name. The default
value is false.
+* `enable_adaptive_pipeline_task_serial_read_on_limit`
+
+ When enabled, the pipeline task concurrency will be adjusted
automatically. When the scan node has no filter conditions and the limit
parameter is less than the number of rows specified in
`adaptive_pipeline_task_serial_read_on_limit`, the parallelism of the scan will
be set to 1.
+
+* `adaptive_pipeline_task_serial_read_on_limit`
+
+ When `enable_adaptive_pipeline_task_serial_read_on_limit` is enabled, the
number of rows at which the parallelism of the scan will be set to 1.
+ Default value is `10000`
+
***
#### Supplementary instructions on statement execution timeout control
diff --git a/versioned_docs/version-3.0/query/query-variables/variables.md
b/versioned_docs/version-3.0/query/query-variables/variables.md
index 93e137bf8d7..d3692081161 100644
--- a/versioned_docs/version-3.0/query/query-variables/variables.md
+++ b/versioned_docs/version-3.0/query/query-variables/variables.md
@@ -700,6 +700,15 @@ Optional values:
Controls whether to extend variant column in desc table_name. The default
value is false.
+* `enable_adaptive_pipeline_task_serial_read_on_limit`
+
+ When enabled, the pipeline task concurrency will be adjusted
automatically. When the scan node has no filter conditions and the limit
parameter is less than the number of rows specified in
`adaptive_pipeline_task_serial_read_on_limit`, the parallelism of the scan will
be set to 1.
+
+* `adaptive_pipeline_task_serial_read_on_limit`
+
+ When `enable_adaptive_pipeline_task_serial_read_on_limit` is enabled, the
number of rows at which the parallelism of the scan will be set to 1.
+ Default value is `10000`
+
***
#### Supplementary instructions on statement execution timeout control
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