ODIn/spark-instrumented-optimizer
1
0
Fork 0
Code Issues Pull requests Projects Releases Wiki Activity
spark-instrumented-optimizer/sql
History
Cheng Su 42f59caf73 [SPARK-35133][SQL] Explain codegen works with AQE 
### What changes were proposed in this pull request?

`EXPLAIN CODEGEN <query>` (and Dataset.explain("codegen")) prints out the generated code for each stage of plan. The current implementation is to match `WholeStageCodegenExec` operator in query plan and prints out generated code (https://github.com/apache/spark/blob/master/sql/core/src/main/scala/org/apache/spark/sql/execution/debug/package.scala#L111-L118 ). This does not work with AQE as we wrap the whole query plan inside `AdaptiveSparkPlanExec` and do not run whole stage code-gen physical plan rule eagerly (`CollapseCodegenStages`). This introduces unexpected behavior change for EXPLAIN query (and Dataset.explain), as we enable AQE by default now.

The change is to explain code-gen for the current executed plan of AQE.

### Why are the changes needed?

Make `EXPLAIN CODEGEN` work same as before.

### Does this PR introduce _any_ user-facing change?

No (when comparing with latest Spark release 3.1.1).

### How was this patch tested?

Added unit test in `ExplainSuite.scala`.

Closes #32430 from c21/explain-aqe.

Authored-by: Cheng Su <chengsu@fb.com>
Signed-off-by: Dongjoon Hyun <dhyun@apple.com>
2021-05-06 20:44:31 -07:00
..
catalyst [SPARK-35318][SQL] Hide internal view properties for describe table cmd 2021-05-06 07:31:34 +00:00
core [SPARK-35133][SQL] Explain codegen works with AQE 2021-05-06 20:44:31 -07:00
hive [SPARK-35105][SQL] Support multiple paths for ADD FILE/JAR/ARCHIVE commands 2021-04-29 13:58:51 +09:00
hive-thriftserver [SPARK-35105][SQL] Support multiple paths for ADD FILE/JAR/ARCHIVE commands 2021-04-29 13:58:51 +09:00
create-docs.sh [SPARK-34010][SQL][DODCS] Use python3 instead of python in SQL documentation build 2021-01-05 19:48:10 +09:00
gen-sql-api-docs.py [SPARK-34747][SQL][DOCS] Add virtual operators to the built-in function document 2021-03-19 10:19:26 +09:00
gen-sql-config-docs.py [SPARK-31550][SQL][DOCS] Set nondeterministic configurations with general meanings in sql configuration doc 2020-04-27 17:08:52 +09:00
gen-sql-functions-docs.py [SPARK-31562][SQL] Update ExpressionDescription for substring, current_date, and current_timestamp 2020-04-26 11:46:52 -07:00
mkdocs.yml [SPARK-30731] Update deprecated Mkdocs option 2020-02-19 17:28:58 +09:00
README.md

README.md

Spark SQL

This module provides support for executing relational queries expressed in either SQL or the DataFrame/Dataset API.

Spark SQL is broken up into four subprojects:

  • Catalyst (sql/catalyst) - An implementation-agnostic framework for manipulating trees of relational operators and expressions.
  • Execution (sql/core) - A query planner / execution engine for translating Catalyst's logical query plans into Spark RDDs. This component also includes a new public interface, SQLContext, that allows users to execute SQL or LINQ statements against existing RDDs and Parquet files.
  • Hive Support (sql/hive) - Includes extensions that allow users to write queries using a subset of HiveQL and access data from a Hive Metastore using Hive SerDes. There are also wrappers that allow users to run queries that include Hive UDFs, UDAFs, and UDTFs.
  • HiveServer and CLI support (sql/hive-thriftserver) - Includes support for the SQL CLI (bin/spark-sql) and a HiveServer2 (for JDBC/ODBC) compatible server.

Running ./sql/create-docs.sh generates SQL documentation for built-in functions under sql/site, and SQL configuration documentation that gets included as part of configuration.md in the main docs directory.