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Fix parallel query on standby servers.
Without this fix, it inevitably bombs out with "ERROR: failed to initialize transaction_read_only to 0". Repair. Ashutosh Sharma; comments adjusted by me.
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src/backend/commands/variable.c

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Original file line numberDiff line numberDiff line change
@@ -482,11 +482,13 @@ show_log_timezone(void)
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* nothing since XactReadOnly will be reset by the next StartTransaction().
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* The IsTransactionState() test protects us against trying to check
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* RecoveryInProgress() in contexts where shared memory is not accessible.
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* (Similarly, if we're restoring state in a parallel worker, just allow
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* the change.)
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*/
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bool
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check_transaction_read_only(bool *newval, void **extra, GucSource source)
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{
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if (*newval == false && XactReadOnly && IsTransactionState())
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if (*newval == false && XactReadOnly && IsTransactionState() && !InitializingParallelWorker)
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{
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/* Can't go to r/w mode inside a r/o transaction */
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if (IsSubTransaction())

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