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Yuming Wang a0f8a072e3 [SPARK-20748][SQL] Add built-in SQL function CH[A]R. 
## What changes were proposed in this pull request?
Add built-in SQL function `CH[A]R`:
For `CHR(bigint|double n)`, returns the ASCII character having the binary equivalent to `n`. If n is larger than 256 the result is equivalent to CHR(n % 256)

## How was this patch tested?
unit tests

Author: Yuming Wang <wgyumg@gmail.com>

Closes #18019 from wangyum/SPARK-20748.
2017-05-26 20:59:14 -07:00
..
catalyst [SPARK-20748][SQL] Add built-in SQL function CH[A]R. 2017-05-26 20:59:14 -07:00
core [SPARK-20873][SQL] Improve the error message for unsupported Column Type 2017-05-26 15:07:28 -07:00
hive [SPARK-20392][SQL] Set barrier to prevent re-entering a tree 2017-05-26 13:45:55 +08:00
hive-thriftserver [SPARK-20393][WEBU UI] Strengthen Spark to prevent XSS vulnerabilities 2017-05-10 10:59:57 +01:00
README.md [SPARK-16557][SQL] Remove stale doc in sql/README.md 2016-07-14 19:24:42 -07:00

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 allows 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.