jonahgao opened a new pull request, #13242:
URL: https://github.com/apache/datafusion/pull/13242
## Which issue does this PR close?
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Closes #4549.
## Rationale for this change
Store the logical plan of the prepared statement in the session state.
During `EXECUTE`, retrieve the prepared logical plan, replace the placeholders
with execution parameters, and then execute.
## What changes are included in this PR?
Support executing prepared statements.
## Are these changes tested?
Yes
## Are there any user-facing changes?
Yes.
`ctx.sql("Prepare p(int) as query")` now returns an empty DataFrame, similar
to Create View and other DDL statements. Previously, it would return a
DataFrame containing the Prepare logical plan.
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