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Yuanjian Li b3e9be470c [SPARK-29229][SQL] Change the additional remote repository in IsolatedClientLoader to google minor 
### What changes were proposed in this pull request?
Change the remote repo used in IsolatedClientLoader from datanucleus to google mirror.

### Why are the changes needed?
We need to connect the Maven repositories in IsolatedClientLoader for downloading Hive jars. The repository currently used is "http://www.datanucleus.org/downloads/maven2", which is [no longer maintained](http://www.datanucleus.org:15080/downloads/maven2/README.txt). This will cause downloading failure and make hive test cases flaky while Jenkins host is blocked by maven central repo.

### Does this PR introduce any user-facing change?
No

### How was this patch tested?
Existing UT.

Closes #25915 from xuanyuanking/SPARK-29229.

Authored-by: Yuanjian Li <xyliyuanjian@gmail.com>
Signed-off-by: Wenchen Fan <wenchen@databricks.com>
2019-09-25 00:49:50 +08:00
..
catalyst [SPARK-28292][SQL] Enable Injection of User-defined Hint 2019-09-24 18:04:17 +08:00
core [SPARK-28292][SQL] Enable Injection of User-defined Hint 2019-09-24 18:04:17 +08:00
hive [SPARK-29229][SQL] Change the additional remote repository in IsolatedClientLoader to google minor 2019-09-25 00:49:50 +08:00
hive-thriftserver [SPARK-28527][SQL][TEST] Enable ThriftServerQueryTestSuite 2019-09-24 00:44:33 -07:00
create-docs.sh
gen-sql-markdown.py [SPARK-27328][SQL] Add 'deprecated' in ExpressionDescription for extended usage and SQL doc 2019-04-09 13:49:42 +08:00
mkdocs.yml
README.md [SPARK-28980][CORE][SQL][STREAMING][MLLIB] Remove most items deprecated in Spark 2.2.0 or earlier, for Spark 3 2019-09-09 10:19:40 -05:00

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 extensions that allow users to write queries using a subset of HiveQL and access data from a Hive Metastore using Hive SerDes. There are also wrappers that allow 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.