rowexec: add debug logs for iterator build and merge join nils #3257
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Add debug-level logs in ExecBuilder.Build and Engine to trace iterator construction and types. Add targeted merge join logs to capture child iter types, filter/comparer assumptions, and nil-operand cases, improving panic diagnostics surfaced by Dolt when running at debug level.
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Add debug-level logs in ExecBuilder.Build and Engine to trace iterator construction and types. Add targeted merge join logs to capture child iter types, filter/comparer assumptions, and nil-operand cases, improving panic diagnostics surfaced by Dolt when running at debug level.