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Zhan Zhang 44e501ace3 [SPARK-19839][CORE] release longArray in BytesToBytesMap 
## What changes were proposed in this pull request?
When BytesToBytesMap spills, its longArray should be released. Otherwise, it may not released until the task complete. This array may take a significant amount of memory, which cannot be used by later operator, such as UnsafeShuffleExternalSorter, resulting in more frequent spill in sorter. This patch release the array as destructive iterator will not use this array anymore.

## How was this patch tested?
Manual test in production

Author: Zhan Zhang <zhanzhang@fb.com>

Closes #17180 from zhzhan/memory.
2017-07-30 18:50:19 -07:00
..
catalyst [SPARK-20962][SQL] Support subquery column aliases in FROM clause 2017-07-29 10:14:47 -07:00
core [SPARK-19839][CORE] release longArray in BytesToBytesMap 2017-07-30 18:50:19 -07:00
hive [SPARK-19451][SQL] rangeBetween method should accept Long value as boundary 2017-07-29 10:11:31 -07:00
hive-thriftserver [SPARK-21297][WEB-UI] Add count in 'JDBC/ODBC Server' page. 2017-07-30 18:44:31 +01:00
create-docs.sh [SPARK-21485][SQL][DOCS] Spark SQL documentation generation for built-in functions 2017-07-26 09:38:51 -07:00
gen-sql-markdown.py [SPARK-21485][SQL][DOCS] Spark SQL documentation generation for built-in functions 2017-07-26 09:38:51 -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.