d4466d55ca
### What changes were proposed in this pull request? Currently, `null + interval` will become `cast(cast(null as timestamp) + interval) as null`. This is a unexpected behavior and the result should not be of null type. This weird behavior applies to `null - interval`, `interval + null`, `interval - null` as well. To change it, I propose to cast the null as the same data type of the other element in the add/subtract: ``` null + interval => cast(null as interval) + interval null - interval => cast(null as interval) - interval interval + null=> interval + cast(null as interval) interval - null => interval - cast(null as interval) ``` ### Why are the changes needed? Change the confusing behavior of `Interval +/- NULL` and `NULL +/- Interval` ### Does this PR introduce _any_ user-facing change? No, the new interval type is not released yet. ### How was this patch tested? Existing UT Closes #33727 from gengliangwang/intervalTypeCoercion. Authored-by: Gengliang Wang <gengliang@apache.org> Signed-off-by: Wenchen Fan <wenchen@databricks.com> |
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catalyst | ||
core | ||
hive | ||
hive-thriftserver | ||
create-docs.sh | ||
gen-sql-api-docs.py | ||
gen-sql-config-docs.py | ||
gen-sql-functions-docs.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 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
, and SQL configuration documentation that gets included as part of configuration.md
in the main docs
directory.