docs: Update/improve SELECT reference #22672
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Which issue does this PR close?
Rationale for this change
Various improvements and cleanups to the
SELECTreference page in the documentation. Update the documentation to cover more of the supported SQL syntax, to include more details when appropriate, and to add more examples.What changes are included in this PR?
SELECTreference page in the documentationpipe_operator.sltto reflect that the pipe operator syntax is now supported in the default SQL dialectAre these changes tested?
Manually and LLM-checked the examples.
Are there any user-facing changes?
Documentation improvements, but should be no regressions. No functional changes in DataFusion.