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Maxim Gekk 4dd0066d40 [SPARK-21914][SQL][TESTS] Check results of expression examples 
### What changes were proposed in this pull request?

New test compares outputs of expression examples in comments with results of `hiveResultString()`. Also I fixed existing examples where actual and expected outputs are different.

### Why are the changes needed?
This prevents mistakes in expression examples, and fixes existing mistakes in comments.

### Does this PR introduce any user-facing change?
No

### How was this patch tested?
Add new test to `SQLQuerySuite`.

Closes #25942 from MaxGekk/run-expr-examples.

Authored-by: Maxim Gekk <max.gekk@gmail.com>
Signed-off-by: HyukjinKwon <gurwls223@apache.org>
2019-09-27 21:30:37 +09:00
..
catalyst [SPARK-21914][SQL][TESTS] Check results of expression examples 2019-09-27 21:30:37 +09:00
core [SPARK-21914][SQL][TESTS] Check results of expression examples 2019-09-27 21:30:37 +09:00
hive [SPARK-29175][SQL] Make additional remote maven repository in IsolatedClientLoader configurable 2019-09-26 20:57:44 -07:00
hive-thriftserver [SPARK-28997][SQL] Add spark.sql.dialect 2019-09-26 21:00:27 +08:00
create-docs.sh
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
README.md [SPARK-28980][CORE][SQL][STREAMING][MLLIB] Remove most items deprecated in Spark 2.2.0 or earlier, for Spark 3 2019-09-09 10:19:40 -05:00

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 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.