990f05c803
## What changes were proposed in this pull request? `AnalysisBarrier` in the current master cuts off explain results for parsed logical plans; ``` scala> Seq((1, 1)).toDF("a", "b").groupBy("a").count().sample(0.1).explain(true) == Parsed Logical Plan == Sample 0.0, 0.1, false, -7661439431999668039 +- AnalysisBarrier Aggregate [a#5], [a#5, count(1) AS count#14L] ``` To fix this, `AnalysisBarrier` needs to override `innerChildren` and this pr changed the output to; ``` == Parsed Logical Plan == Sample 0.0, 0.1, false, -5086223488015741426 +- AnalysisBarrier +- Aggregate [a#5], [a#5, count(1) AS count#14L] +- Project [_1#2 AS a#5, _2#3 AS b#6] +- LocalRelation [_1#2, _2#3] ``` ## How was this patch tested? Added tests in `DataFrameSuite`. Author: Takeshi Yamamuro <yamamuro@apache.org> Closes #20247 from maropu/SPARK-23021-2. |
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catalyst | ||
core | ||
hive | ||
hive-thriftserver | ||
create-docs.sh | ||
gen-sql-markdown.py | ||
mkdocs.yml | ||
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
.