Commits on Aug 21, 2026

1. Remove synchronous prepare from pgbench

   Pgbench waits for the result of a prepare packet synchronously
   when the prepared protocol flag is provided. For this reason
   it is impossible to use it with some poolers (such as PgBouncer)
   in the session pooling mode.
   Replace the blocking PQprepare() call in the single-command path
   with an async PQsendPrepare(), and add a new CSTATE_WAIT_PREPARE_RESULT
   state to the connection state machine that drains the prepare result
   without stalling the thread's event loop. After the prepare succeeds,
   the prepared flag is set and the actual query is sent via
   PQsendQueryPrepared as before. The pipeline path
   (prepareCommandsInPipeline) is left synchronous because prepares must
   complete before PQenterPipelineMode to avoid acquiring a snapshot
   that would break BEGIN ISOLATION LEVEL SERIALIZABLE.
   Also fix a latent bug: prepareCommand used to set the prepared flag
   to true even when the prepare failed, so subsequent attempts ran
   PQsendQueryPrepared against a non-existent statement. The flag is
   now set only on success, and prepare failures are routed through the
   normal error path (CSTATE_ERROR for retryable errors, CSTATE_ABORTED
   otherwise). Update the sql-syntax-error TAP test accordingly: it no
   longer expects the downstream "prepared statement does not exist"
   error.

   

   authored and Commitfest Bot committed

   Aug 21, 2026
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