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5a13ff09e9
As observed in #10026, after schema changes it somehow happened that a column defition that does not match any of the base table columns was passed to expression verification code. The function that looks up the index of a column happens to return -1 when it doesn't find anything, so using this returned index without checking if it's nonnegative results in accessing invalid vector data, and a segfault or silent memory corruption. Therefore, an explicit check is added to see if the column was actually found. This serves two purposes: - avoiding segfaults/memory corruption - making it easier to investigate the root cause of #10026 Closes #10039