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Dilip Biswal 8a8643c28d [SPARK-27480][SQL] Improve EXPLAIN DESC QUERY to show the input SQL statement 
Currently running explain on describe query gives a little confusing output. This is a minor pr that improves the output of explain.

Before
```
1.EXPLAIN DESCRIBE WITH s AS (SELECT 'hello' as col1) SELECT * FROM s;
== Physical Plan ==
Execute DescribeQueryCommand
   +- DescribeQueryCommand CTE [s]
2.EXPLAIN EXTENDED DESCRIBE SELECT * from s1 where c1 > 0;
== Physical Plan ==
Execute DescribeQueryCommand
   +- DescribeQueryCommand 'Project [*]
```
After
```
1. EXPLAIN DESCRIBE WITH s AS (SELECT 'hello' as col1) SELECT * FROM s;
== Physical Plan ==
Execute DescribeQueryCommand
   +- DescribeQueryCommand WITH s AS (SELECT 'hello' as col1) SELECT * FROM s
2. EXPLAIN DESCRIBE SELECT * from s1 where c1 > 0;
== Physical Plan ==
Execute DescribeQueryCommand
   +- DescribeQueryCommand SELECT * from s1 where c1 > 0
```
Added a couple of tests in describe-query.sql under SQLQueryTestSuite.

Closes #24385 from dilipbiswal/describe_query_explain.

Authored-by: Dilip Biswal <dbiswal@us.ibm.com>
Signed-off-by: Dongjoon Hyun <dhyun@apple.com>
2019-04-21 15:35:05 -07:00
..
catalyst [SPARK-27527][SQL][DOCS] Improve descriptions of Timestamp and Date types 2019-04-21 16:53:11 +09:00
core [SPARK-27480][SQL] Improve EXPLAIN DESC QUERY to show the input SQL statement 2019-04-21 15:35:05 -07:00
hive [SPARK-27501][SQL][TEST] Add test for HIVE-13083: Writing HiveDecimal to ORC can wrongly suppress present stream 2019-04-19 10:12:21 +09:00
hive-thriftserver [SPARK-27404][CORE][SQL][STREAMING][YARN] Fix build warnings for 3.0: postfixOps edition 2019-04-11 13:43:44 -05:00
create-docs.sh [MINOR][DOCS] Minor doc fixes related with doc build and uses script dir in SQL doc gen script 2017-08-26 13:56:24 +09:00
gen-sql-markdown.py [SPARK-27328][SQL] Add 'deprecated' in ExpressionDescription for extended usage and SQL doc 2019-04-09 13:49:42 +08:00
mkdocs.yml [SPARK-21485][SQL][DOCS] Spark SQL documentation generation for built-in functions 2017-07-26 09:38:51 -07:00
README.md [MINOR][DOC] Fix some typos and grammar issues 2018-04-06 13:37:08 +08:00

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 an extension of SQLContext called HiveContext that allows 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.