Function ExecParallelGetQueryDesc

src/backend/executor/execParallel.c:1232–1258

* Create a QueryDesc for the PlannedStmt we are to execute, and return it. */

 * Create a QueryDesc for the PlannedStmt we are to execute, and return it.
 */
static QueryDesc *
ExecParallelGetQueryDesc(shm_toc *toc, DestReceiver *receiver,
						 int instrument_options)
{
	char	   *pstmtspace;
	char	   *paramspace;
	PlannedStmt *pstmt;
	ParamListInfo paramLI;
	char	   *queryString;

	/* Get the query string from shared memory */
	queryString = shm_toc_lookup(toc, PARALLEL_KEY_QUERY_TEXT, false);

	/* Reconstruct leader-supplied PlannedStmt. */
	pstmtspace = shm_toc_lookup(toc, PARALLEL_KEY_PLANNEDSTMT, false);
	pstmt = (PlannedStmt *) stringToNode(pstmtspace);

	/* Reconstruct ParamListInfo. */
	paramspace = shm_toc_lookup(toc, PARALLEL_KEY_PARAMLISTINFO, false);
	paramLI = RestoreParamList(&paramspace);

	/* Create a QueryDesc for the query. */
	return CreateQueryDesc(pstmt,
						   queryString,
						   GetActiveSnapshot(), InvalidSnapshot,
						   receiver, paramLI, NULL, instrument_options);
}

/*
 * Copy instrumentation information from this node and its descendants into