[GitHub] [spark] dilipbiswal opened a new pull request #23995: [SQL][MINOR][TEST] Include usage example for generating output for single test in SQLQueryTestSuite

[GitBox <gi...@apache.org>]

dilipbiswal opened a new pull request #23995: [SQL][MINOR][TEST] Include usage example for generating output for single test in SQLQueryTestSuite
URL: https://github.com/apache/spark/pull/23995
 
 
   ## What changes were proposed in this pull request?
   This is a very minor pr to include the usage example to generate output for single test in SQLQueryTestSuite. I tried to deduce it from the existing example and ran into a scenario 
   where sbt is simply looping to run the same test over and over again. Here is the example
   of running a single test.
   
   ```
   build/sbt "~sql/test-only *SQLQueryTestSuite -- -z inline-table.sql"
   ```
   I tried to generate the output for a single test by prepending `SPARK_GENERATE_GOLDEN_FILES=1` like following
   ```
   SPARK_GENERATE_GOLDEN_FILES=1 build/sbt "~sql/test-only *SQLQueryTestSuite -- -z describe.sql"
   ```
   In this case i found that sbt is looping trying to run describe.sql over and over again as we are running the test in on continuous mode (because of `~` prefix ) where it detects a change in 
   the generated result file which in turn triggers a build and test. I have included an example where
   we don't run it in continuous when generating the output. Hopefully it saves other developers some time.
   ## How was this patch tested?
   Verified manually in my dev setup.

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