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Takeshi Yamamuro 363bfe30ba [SPARK-20073][SQL] Prints an explicit warning message in case of NULL-safe equals 
## What changes were proposed in this pull request?
This pr added code to print the same warning messages with `===` cases when using NULL-safe equals (`<=>`).

## How was this patch tested?
Existing tests.

Author: Takeshi Yamamuro <yamamuro@apache.org>

Closes #18436 from maropu/SPARK-20073.
2017-07-03 10:14:03 -07:00
..
catalyst [SPARK-21102][SQL] Refresh command is too aggressive in parsing 2017-07-03 09:35:49 -07:00
core [SPARK-20073][SQL] Prints an explicit warning message in case of NULL-safe equals 2017-07-03 10:14:03 -07:00
hive [TEST] Load test table based on case sensitivity 2017-07-03 09:01:42 -07:00
hive-thriftserver [SPARK-20345][SQL] Fix STS error handling logic on HiveSQLException 2017-06-12 14:05:03 -07:00
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.