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In the not-too-likely scenario where we successfully created a hash table entry for a TS dictionary, but then failed to make a small memory context for it, we left the hash entry in existence but with a garbage value for dictCtx. This confused the code the next time through, leading to a crash. Rearrange things so that we leave the hash entry in a well-defined state with dictCtx == NULL, and then the next try knows it still needs to make a memory context. Reported-by: Alexander Lakhin <exclusion@gmail.com> Author: Tom Lane <tgl@sss.pgh.pa.us> Discussion: https://postgr.es/m/0f3ddeb5-0dbd-479c-9d0e-ae254758e624@gmail.com Backpatch-through: 14