Add test coverage for indirection transformation

Peter Eisentraut <peter@eisentraut.org>

Commit: 64492917280a1f6227ed9cf43d39095e2cec5cab
Author: Peter Eisentraut <peter@eisentraut.org>
Date: 2026-01-06T08:45:17Z
Add test coverage for indirection transformation

These tests cover nested arrays of composite data types,
single-argument functions, and casting using dot-notation, providing a
baseline for future enhancements to jsonb dot-notation support.

Author: Alexandra Wang <alexandra.wang.oss@gmail.com>
Reviewed-by: Chao Li <li.evan.chao@gmail.com>
Discussion: https://www.postgresql.org/message-id/flat/CAK98qZ1JNNAx4QneJG+eX7iLesOhd6A68FNQVvvHP6Up_THf3A@mail.gmail.com

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