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Yuanjian Li 7c3e8995f1 [SPARK-23533][SS] Add support for changing ContinuousDataReader's startOffset 
## What changes were proposed in this pull request?

As discussion in #20675, we need add a new interface `ContinuousDataReaderFactory` to support the requirements of setting start offset in Continuous Processing.

## How was this patch tested?

Existing UT.

Author: Yuanjian Li <xyliyuanjian@gmail.com>

Closes #20689 from xuanyuanking/SPARK-23533.
2018-03-15 00:04:28 -07:00
..
catalyst [SPARK-23656][TEST] Perform assertions in XXH64Suite.testKnownByteArrayInputs() on big endian platform, too 2018-03-13 15:20:09 +01:00
core [SPARK-23533][SS] Add support for changing ContinuousDataReader's startOffset 2018-03-15 00:04:28 -07:00
hive [MINOR][SQL][TEST] Create table using dataSourceName in HadoopFsRelationTest 2018-03-13 23:31:08 +09:00
hive-thriftserver [SPARK-23547][SQL] Cleanup the .pipeout file when the Hive Session closed 2018-03-13 11:31:32 -07:00
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.