minor: fix duplicate column bug in subquery support #2362
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Which issue does this PR close?
N/A
Rationale for this change
This is a follow-up to the recently merged subquery expression support and fixes a bug where a schema was being extended rather than merged (which handles duplicate columns correctly). Without this fix, the test added in this PR will fail with a "Schema contains duplicate qualified field name" error due to both the subquery input and the outer query containing fields from the table "person".
What changes are included in this PR?
Merge schemas.
Are there any user-facing changes?
No