Sean-Kenneth-Doherty opened a new pull request, #22299:
URL: https://github.com/apache/datafusion/pull/22299

   ## Which issue does this PR close?
   
   - Closes #22224.
   
   ## Rationale for this change
   
   `EXPLAIN INSERT INTO t VALUES ($0)` currently panics while inferring 
parameter types for INSERT VALUES. Other SQL paths already reject `$0` as an 
invalid placeholder index, and the INSERT inference path should do the same 
instead of subtracting one from zero.
   
   ## What changes are included in this PR?
   
   - Adds a zero-index guard before INSERT VALUES placeholder numbers are 
converted to parameter vector positions.
   - Aligns the INSERT VALUES error with the existing invalid-placeholder 
planning error.
   - Adds a standalone SQL logic regression for `EXPLAIN INSERT INTO ... VALUES 
($0)`.
   
   ## Are these changes tested?
   
   Yes.
   
   - `cargo test -p datafusion-sqllogictest --test sqllogictests -- 
insert_values_placeholders.slt`
   - `cargo test -p datafusion-sql`
   - `cargo fmt --check`
   - `cargo clippy -p datafusion-sql --all-targets -- -D warnings`
   - `git diff --cached --check`
   
   ## Are there any user-facing changes?
   
   Yes. `INSERT ... VALUES ($0)` now returns a planning error instead of 
panicking.
   
   ## Scope note
   
   The change is limited to INSERT VALUES placeholder type inference and the 
new regression coverage. I did not find any broader placeholder semantics that 
needed to change.
   


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