ODIn/spark-instrumented-optimizer
1
0
Fork 0
Code Issues Pull requests Projects Releases Wiki Activity
spark-instrumented-optimizer/sql
History
Terry Kim 66619b84d8 [SPARK-29630][SQL] Disallow creating a permanent view that references a temporary view in an expression 
### What changes were proposed in this pull request?

Disallow creating a permanent view that references a temporary view in **expressions**.

### Why are the changes needed?

Creating a permanent view that references a temporary view is currently disallowed. For example,
```SQL
# The following throws org.apache.spark.sql.AnalysisException
# Not allowed to create a permanent view `per_view` by referencing a temporary view `tmp`;
CREATE VIEW per_view AS SELECT t1.a, t2.b FROM base_table t1, (SELECT * FROM tmp) t2"
```
However, the following is allowed.
```SQL

CREATE VIEW per_view AS SELECT * FROM base_table WHERE EXISTS (SELECT * FROM tmp);
```
This PR fixes the bug where temporary views used inside expressions are not checked.

### Does this PR introduce any user-facing change?

Yes. Now the following SQL query throws an exception as expected:
```SQL
# The following throws org.apache.spark.sql.AnalysisException
# Not allowed to create a permanent view `per_view` by referencing a temporary view `tmp`;
CREATE VIEW per_view AS SELECT * FROM base_table WHERE EXISTS (SELECT * FROM tmp);
```

### How was this patch tested?

Added new unit tests.

Closes #26361 from imback82/spark-29630.

Authored-by: Terry Kim <yuminkim@gmail.com>
Signed-off-by: Wenchen Fan <wenchen@databricks.com>
2019-11-05 13:19:46 +08:00
..
catalyst [SPARK-29734][SQL] Datasource V2: Support SHOW CURRENT NAMESPACE 2019-11-04 18:05:10 -08:00
core [SPARK-29630][SQL] Disallow creating a permanent view that references a temporary view in an expression 2019-11-05 13:19:46 +08:00
hive Revert "Prepare Spark release v3.0.0-preview-rc2" 2019-10-30 17:45:44 -07:00
hive-thriftserver [SPARK-29742][BUILD] Update checkstyle plugin's check dir scope 2019-11-04 09:08:47 -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-27328][SQL] Add 'deprecated' in ExpressionDescription for extended usage and SQL doc 2019-04-09 13:49:42 +08:00
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-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.