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Li Jin 4e6f8fb150 [SPARK-23047][PYTHON][SQL] Change MapVector to NullableMapVector in ArrowColumnVector 
## What changes were proposed in this pull request?
This PR changes usage of `MapVector` in Spark codebase to use `NullableMapVector`.

`MapVector` is an internal Arrow class that is not supposed to be used directly. We should use `NullableMapVector` instead.

## How was this patch tested?

Existing test.

Author: Li Jin <ice.xelloss@gmail.com>

Closes #20239 from icexelloss/arrow-map-vector.
2018-01-18 07:26:43 +09:00
..
catalyst [SPARK-23079][SQL] Fix query constraints propagation with aliases 2018-01-18 00:05:26 +08:00
core [SPARK-23047][PYTHON][SQL] Change MapVector to NullableMapVector in ArrowColumnVector 2018-01-18 07:26:43 +09:00
hive [SPARK-23072][SQL][TEST] Add a Unicode schema test for file-based data sources 2018-01-17 14:32:18 +08:00
hive-thriftserver [SPARK-23028] Bump master branch version to 2.4.0-SNAPSHOT 2018-01-13 00:37:59 +08:00
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-21485][FOLLOWUP][SQL][DOCS] Describes examples and arguments separately, and note/since in SQL built-in function documentation 2017-08-05 10:10:56 -07:00
mkdocs.yml [SPARK-21485][SQL][DOCS] Spark SQL documentation generation for built-in functions 2017-07-26 09:38:51 -07:00
README.md [SPARK-21485][SQL][DOCS] Spark SQL documentation generation for built-in functions 2017-07-26 09:38:51 -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.

Running sql/create-docs.sh generates SQL documentation for built-in functions under sql/site.