b7da108cae
### What changes were proposed in this pull request? This is a followup PR for SPARK-33690 (#30647) . In addition to the original PR, this PR intends to escape the following meta-characters in `Dataset#showString`. * `\r` (carrige ret) * `\f` (form feed) * `\b` (backspace) * `\u000B` (vertical tab) * `\u0007` (bell) ### Why are the changes needed? To avoid breaking the layout of `Dataset#showString`. `\u0007` does not break the layout of `Dataset#showString` but it's noisy (beeps for each row) so it should be also escaped. ### Does this PR introduce _any_ user-facing change? No. ### How was this patch tested? Modified the existing tests. I also build the documents and check the generated html for `sql-migration-guide.md`. Closes #31144 from sarutak/escape-metacharacters-in-getRows. Authored-by: Kousuke Saruta <sarutak@oss.nttdata.com> Signed-off-by: Sean Owen <srowen@gmail.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.