beliefer opened a new pull request, #36708: URL: https://github.com/apache/spark/pull/36708
### What changes were proposed in this pull request? `REGR_INTERCEPT` is an ANSI aggregate functions **Syntax**: REGR_INTERCEPT(y, x) **Arguments**: - **y**:The dependent variable. This must be an expression that can be evaluated to a numeric type. - **x**:The independent variable. This must be an expression that can be evaluated to a numeric type. **Examples**: `select k, regr_intercept(v, v2) from aggr group by k;` | k | regr_intercept(v, v2) | |---|--------------------| | 1 | [NULL] | | 2 | 1.154734411 | The algorithm refers https://en.wikipedia.org/wiki/Algorithms_for_calculating_variance The mainstream database supports `regr_intercept` show below: **Teradata** https://docs.teradata.com/r/kmuOwjp1zEYg98JsB8fu_A/MpkZBV~MSTZ~I84I~ezxNg **Snowflake** https://docs.snowflake.com/en/sql-reference/functions/regr_intercept.html **Oracle** https://docs.oracle.com/en/database/oracle/oracle-database/19/sqlrf/REGR_-Linear-Regression-Functions.html#GUID-A675B68F-2A88-4843-BE2C-FCDE9C65F9A9 **DB2** https://www.ibm.com/docs/en/db2/11.5?topic=af-regression-functions-regr-avgx-regr-avgy-regr-count **H2** http://www.h2database.com/html/functions-aggregate.html#regr_intercept **Postgresql** https://www.postgresql.org/docs/8.4/functions-aggregate.html **Sybase** https://infocenter.sybase.com/help/index.jsp?topic=/com.sybase.help.sqlanywhere.12.0.0/dbreference/regr-intercept-function.html **Presto** https://prestodb.io/docs/current/functions/aggregate.html Exasol https://docs.exasol.com/sql_references/functions/alphabeticallistfunctions/regr_function.htm ### Why are the changes needed? `REGR_INTERCEPT` is very useful. ### Does this PR introduce _any_ user-facing change? 'No'. New feature. ### How was this patch tested? New tests. -- This is an automated message from the Apache Git Service. To respond to the message, please log on to GitHub and use the URL above to go to the specific comment. To unsubscribe, e-mail: reviews-unsubscr...@spark.apache.org For queries about this service, please contact Infrastructure at: us...@infra.apache.org --------------------------------------------------------------------- To unsubscribe, e-mail: reviews-unsubscr...@spark.apache.org For additional commands, e-mail: reviews-h...@spark.apache.org
