eugen yushin created SPARK-54056:
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Summary: Enable substitution for SQLConf settings
Key: SPARK-54056
URL: https://issues.apache.org/jira/browse/SPARK-54056
Project: Spark
Issue Type: Bug
Components: SQL
Affects Versions: 4.0.1
Reporter: eugen yushin
Values set for custom catalogs are not being substituted:
```
spark.sql.catalog.mssql=org.apache.spark.sql.execution.datasources.v2.jdbc.JDBCTableCatalog
spark.sql.catalog.mssql.user=${env:MSSQL__USER}
```
Fails with:
```
spark.sql("show tables in mssql").show()
com.microsoft.sqlserver.jdbc.SQLServerException: Login failed for user
'${env:MSSQL__USER}'
```
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