Well not to put too finer point on it, in a public forum, one ought to respect the importance of open communication. Everyone has the right to ask questions, seek information, and engage in discussions without facing unnecessary patronization.
Mich Talebzadeh, Dad | Technologist | Solutions Architect | Engineer London United Kingdom view my Linkedin profile <https://www.linkedin.com/in/mich-talebzadeh-ph-d-5205b2/> https://en.everybodywiki.com/Mich_Talebzadeh *Disclaimer:* Use it at your own risk. Any and all responsibility for any loss, damage or destruction of data or any other property which may arise from relying on this email's technical content is explicitly disclaimed. The author will in no case be liable for any monetary damages arising from such loss, damage or destruction. On Sun, 24 Dec 2023 at 18:27, Nicholas Chammas <nicholas.cham...@gmail.com> wrote: > This is a user-list question, not a dev-list question. Moving this > conversation to the user list and BCC-ing the dev list. > > Also, this statement > > > We are not validating against table or column existence. > > is not correct. When you call spark.sql(…), Spark will lookup the table > references and fail with TABLE_OR_VIEW_NOT_FOUND if it cannot find them. > > Also, when you run DDL via spark.sql(…), Spark will actually run it. So > spark.sql(“drop table my_table”) will actually drop my_table. It’s not a > validation-only operation. > > This question of validating SQL is already discussed on Stack Overflow > <https://stackoverflow.com/q/46973729/877069>. You may find some useful > tips there. > > Nick > > > On Dec 24, 2023, at 4:52 AM, Mich Talebzadeh <mich.talebza...@gmail.com> > wrote: > > > Yes, you can validate the syntax of your PySpark SQL queries without > connecting to an actual dataset or running the queries on a cluster. > PySpark provides a method for syntax validation without executing the > query. Something like below > ____ __ > / __/__ ___ _____/ /__ > _\ \/ _ \/ _ `/ __/ '_/ > /__ / .__/\_,_/_/ /_/\_\ version 3.4.0 > /_/ > > Using Python version 3.9.16 (main, Apr 24 2023 10:36:11) > Spark context Web UI available at http://rhes75:4040 > Spark context available as 'sc' (master = local[*], app id = > local-1703410019374). > SparkSession available as 'spark'. > >>> from pyspark.sql import SparkSession > >>> spark = SparkSession.builder.appName("validate").getOrCreate() > 23/12/24 09:28:02 WARN SparkSession: Using an existing Spark session; only > runtime SQL configurations will take effect. > >>> sql = "SELECT * FROM <TABLE> WHERE <COLUMN> = some value" > >>> try: > ... spark.sql(sql) > ... print("is working") > ... except Exception as e: > ... print(f"Syntax error: {e}") > ... > Syntax error: > [PARSE_SYNTAX_ERROR] Syntax error at or near '<'.(line 1, pos 14) > > == SQL == > SELECT * FROM <TABLE> WHERE <COLUMN> = some value > --------------^^^ > > Here we only check for syntax errors and not the actual existence of query > semantics. We are not validating against table or column existence. > > This method is useful when you want to catch obvious syntax errors before > submitting your PySpark job to a cluster, especially when you don't have > access to the actual data. > > In summary > > - Theis method validates syntax but will not catch semantic errors > - If you need more comprehensive validation, consider using a testing > framework and a small dataset. > - For complex queries, using a linter or code analysis tool can help > identify potential issues. > > HTH > > > Mich Talebzadeh, > Dad | Technologist | Solutions Architect | Engineer > London > United Kingdom > > view my Linkedin profile > <https://www.linkedin.com/in/mich-talebzadeh-ph-d-5205b2/> > > > https://en.everybodywiki.com/Mich_Talebzadeh > > > *Disclaimer:* Use it at your own risk. Any and all responsibility for any > loss, damage or destruction of data or any other property which may arise > from relying on this email's technical content is explicitly disclaimed. > The author will in no case be liable for any monetary damages arising from > such loss, damage or destruction. > > > > > On Sun, 24 Dec 2023 at 07:57, ram manickam <ramsidm...@gmail.com> wrote: > >> Hello, >> Is there a way to validate pyspark sql to validate only syntax errors?. I >> cannot connect do actual data set to perform this validation. Any >> help would be appreciated. >> >> >> Thanks >> Ram >> > >
