MaxGekk opened a new pull request #34782:
URL: https://github.com/apache/spark/pull/34782


   ### What changes were proposed in this pull request?
   In the PR, I propose to expose the existing string expression `StartsWith` 
and `EndsWith` as functions to Spark SQL.
   
   ### Why are the changes needed?
   To make migration from other systems easier for new Spark users. The 
functions are popular, and broadly used in other systems. For example,
   
   Snowflake:
   https://docs.snowflake.com/en/sql-reference/functions/startswith.html
   https://docs.snowflake.com/en/sql-reference/functions/endswith.html
   
   Cosmos DB:
   https://docs.microsoft.com/en-us/azure/cosmos-db/sql/sql-query-startswith
   https://docs.microsoft.com/en-us/azure/cosmos-db/sql/sql-query-endswith
   
   ### Does this PR introduce _any_ user-facing change?
   No
   
   ### How was this patch tested?
   By running new tests:
   ```
   $ build/sbt "sql/testOnly *SQLQueryTestSuite -- -z string-functions.sql"
   $ build/sbt "sql/test:testOnly 
org.apache.spark.sql.expressions.ExpressionInfoSuite"
   ```


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