andygrove opened a new pull request #35853:
URL: https://github.com/apache/spark/pull/35853
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### What changes were proposed in this pull request?
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According to SQL-1999 (the latest version of the ANSI SQL specification that
I have access to), SQL strings are quoted with single quotes (`'`), and
"delimited identifiers" are quoted with double-quotes (`"`).
Spark currently supports both single and double quotes for strings, which is
not ANSI-compliant, and does not support double-quotes for identifiers, only
backticks.
This PR brings Spark closer to the ANSI specified behavior with single
quotes for strings and double quotes for identifiers.
### Why are the changes needed?
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The main motivation is to support the official TPC-DS queries, which use
double-quoted aliases.
### Does this PR introduce _any_ user-facing change?
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Yes, users will no longer be able to use double quotes for strings and will
need to use single quotes instead.
### How was this patch tested?
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`ExpressionParserSuite` was updated. I am in the process of running the full
suite locally and running some manual tests.
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