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Don't consider parallel append for parallel unsafe paths.
Commit ab72716778
allowed Parallel Append paths to be generated for a
relation that is not parallel safe. Prevent that from happening.
Initial analysis by Tom Lane.
Reported-by: Rajkumar Raghuwanshi
Author: Amit Kapila and Rajkumar Raghuwanshi
Reviewed-by: Amit Khandekar and Robert Haas
Discussion:https://postgr.es/m/CAKcux6=tPJ6nJ08r__nU_pmLQiC0xY15Fn0HvG1Cprsjdd9s_Q@mail.gmail.com
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@ -1383,7 +1383,7 @@ add_paths_to_append_rel(PlannerInfo *root, RelOptInfo *rel,
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List *pa_partial_subpaths = NIL;
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List *pa_nonpartial_subpaths = NIL;
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bool partial_subpaths_valid = true;
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bool pa_subpaths_valid = enable_parallel_append;
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bool pa_subpaths_valid;
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List *all_child_pathkeys = NIL;
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List *all_child_outers = NIL;
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ListCell *l;
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@ -1391,6 +1391,9 @@ add_paths_to_append_rel(PlannerInfo *root, RelOptInfo *rel,
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bool build_partitioned_rels = false;
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double partial_rows = -1;
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/* If appropriate, consider parallel append */
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pa_subpaths_valid = enable_parallel_append && rel->consider_parallel;
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/*
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* AppendPath generated for partitioned tables must record the RT indexes
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* of partitioned tables that are direct or indirect children of this
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