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shahid cd2ef9cb43 [SPARK-35567][SQL] Fix: Explain cost is not showing statistics for all the nodes 
### What changes were proposed in this pull request?
Explain cost command in spark currently doesn't show statistics for all the nodes. It misses some nodes in almost all the TPCDS queries.
In this PR, we are collecting all the plan nodes including the subqueries and computing  the statistics for each node, if it doesn't exists in stats cache,

### Why are the changes needed?
**Before Fix**
For eg: Query1,  Project node doesn't have statistics
![image](https://user-images.githubusercontent.com/23054875/120123442-868feb00-c1cc-11eb-9af9-3a87bf2117d2.png)

Query15, Aggregate node doesn't have statistics

![image](https://user-images.githubusercontent.com/23054875/120123296-a4108500-c1cb-11eb-89df-7fddd651572e.png)

**After Fix:**
Query1:
![image](https://user-images.githubusercontent.com/23054875/120123559-1df53e00-c1cd-11eb-938a-53704f5240e6.png)
Query 15:
![image](https://user-images.githubusercontent.com/23054875/120123665-bb507200-c1cd-11eb-8ea2-84c732215bac.png)
### Does this PR introduce _any_ user-facing change?
No

### How was this patch tested?
Manual testing

Closes #32704 from shahidki31/shahid/fixshowstats.

Authored-by: shahid <shahidki31@gmail.com>
Signed-off-by: Wenchen Fan <wenchen@databricks.com>
2021-06-01 00:55:29 +08:00
..
catalyst [SPARK-35411][SQL][FOLLOWUP] Handle Currying Product while serializing TreeNode to JSON 2021-05-31 22:15:26 +08:00
core [SPARK-35567][SQL] Fix: Explain cost is not showing statistics for all the nodes 2021-06-01 00:55:29 +08:00
hive [SPARK-35526][CORE][SQL][ML][MLLIB] Re-Cleanup procedure syntax is deprecated compilation warning in Scala 2.13 2021-05-30 16:49:47 -07:00
hive-thriftserver [SPARK-35057][SQL] Group exception messages in hive/thriftserver 2021-05-27 07:31:14 +00:00
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-32194][PYTHON] Use proper exception classes instead of plain Exception 2021-05-26 11:54:40 +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
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.