2ceed6f32c
### What changes were proposed in this pull request? Where it generates a deprecation warning in Scala 2.13, replace Symbol shorthand syntax `'foo` with an equivalent. ### Why are the changes needed? Symbol syntax `'foo` is deprecated in Scala 2.13. The lines changed below otherwise generate about 440 warnings when building for 2.13. The previous PR directly replaced many usages with `Symbol("foo")`. But it's also used to specify Columns via implicit conversion (`.select('foo)`) or even where simple Strings are used (`.as('foo)`), as it's kind of an abstraction for interned Strings. While I find this syntax confusing and would like to deprecate it, here I just replaced it where it generates a build warning (not sure why all occurrences don't): `$"foo"` or just `"foo"`. ### Does this PR introduce any user-facing change? Should not change behavior. ### How was this patch tested? Existing tests. Closes #26748 from srowen/SPARK-29392.2. Authored-by: Sean Owen <sean.owen@databricks.com> Signed-off-by: Dongjoon Hyun <dhyun@apple.com> |
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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 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
.