/*
* ReScanExprContext
*
* Reset an expression context in preparation for a rescan of its
* plan node. This requires calling any registered shutdown callbacks,
* since any partially complete set-returning-functions must be canceled.
*
* Note we make no assumption about the caller's memory context.
*/
void
ReScanExprContext(ExprContext *econtext)
{
/* Call any registered callbacks */
ShutdownExprContext(econtext, true);
/* And clean up the memory used */
MemoryContextReset(econtext->ecxt_per_tuple_memory);
}
/* ----------------
* FreeExprContext
*
* Free an expression context, including calling any remaining
* shutdown callbacks.
*
* Since we free the temporary context used for expression evaluation,
* any previously computed pass-by-reference expression result will go away!
*
* Note we make no assumption about the caller's memory context.
* ----------------
*/
void
FreeExprContext(ExprContext *econtext)
{
EState *estate;
/* Call any registered callbacks */
ShutdownExprContext(econtext);
/* And clean up the memory used */
MemoryContextDelete(econtext->ecxt_per_tuple_memory);
/* Unlink self from owning EState */
estate = econtext->ecxt_estate;
estate->es_exprcontexts = list_delete_ptr(estate->es_exprcontexts, econtext);
/* And delete the ExprContext node */
pfree(econtext);
}
/* ----------------
* free_expr_ctx
*
* Free an expression context, including calling any remaining
* shutdown callbacks.
*
* Since we free the temporary context used for expression evaluation,
* any previously computed pass-by-reference expression result will go away!
*
* If isCommit is false, we are being called in error cleanup, and should
* not call callbacks but only release memory. (It might be better to call
* the callbacks and pass the isCommit flag to them, but that would require
* more invasive code changes than currently seems justified.)
*
* Note we make no assumption about the caller's memory context.
* ----------------
*/
void
free_expr_ctx(expr_ctx_n* econtext, bool isCommit)
{
exec_state_n* estate;
/* Call any registered callbacks */
ShutdownExprContext(econtext, isCommit);
/* And clean up the memory used */
mctx_delete(econtext->ecxt_per_tuple_memory);
/* Unlink self from owning exec_state_n, if any */
estate = econtext->ecxt_estate;
if (estate)
estate->es_exprcontexts = list_delete_ptr(estate->es_exprcontexts, econtext);
/* And delete the expr_ctx_n node */
pfree(econtext);
}
