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Improve EXPLAIN's display of window functions. 

8b1b342544b69b281ffd3aafe594aec629ec4d3c
pull/8010/head
Mehmet Yilmaz 2025-05-30 09:36:22 +00:00
parent 26fd672333
commit 485feb6acc
1 changed files with 81 additions and 40 deletions
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97
src/backend/distributed/deparser/ruleutils_18.c
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@ -390,6 +390,9 @@ static void get_rule_orderby(List *orderList, List *targetList,
static void get_rule_windowclause(Query *query, deparse_context *context);
static void get_rule_windowspec(WindowClause *wc, List *targetList,
deparse_context *context);
static void get_window_frame_options(int frameOptions,
Node *startOffset, Node *endOffset,
deparse_context *context);
static char *get_variable(Var *var, int levelsup, bool istoplevel,
deparse_context *context);
static void get_special_variable(Node *node, deparse_context *context,
@ -3249,45 +3252,64 @@ get_rule_windowspec(WindowClause *wc, List *targetList,
{
if (needspace)
appendStringInfoChar(buf, ' ');
if (wc->frameOptions & FRAMEOPTION_RANGE)
get_window_frame_options(wc->frameOptions,
wc->startOffset, wc->endOffset,
context);
}
appendStringInfoChar(buf, ')');
}
/*
* Append the description of a window's framing options to context->buf
*/
static void
get_window_frame_options(int frameOptions,
Node *startOffset, Node *endOffset,
deparse_context *context)
{
StringInfo buf = context->buf;
if (frameOptions & FRAMEOPTION_NONDEFAULT)
{
if (frameOptions & FRAMEOPTION_RANGE)
appendStringInfoString(buf, "RANGE ");
else if (wc->frameOptions & FRAMEOPTION_ROWS)
else if (frameOptions & FRAMEOPTION_ROWS)
appendStringInfoString(buf, "ROWS ");
else if (wc->frameOptions & FRAMEOPTION_GROUPS)
else if (frameOptions & FRAMEOPTION_GROUPS)
appendStringInfoString(buf, "GROUPS ");
else
Assert(false);
if (wc->frameOptions & FRAMEOPTION_BETWEEN)
if (frameOptions & FRAMEOPTION_BETWEEN)
appendStringInfoString(buf, "BETWEEN ");
if (wc->frameOptions & FRAMEOPTION_START_UNBOUNDED_PRECEDING)
if (frameOptions & FRAMEOPTION_START_UNBOUNDED_PRECEDING)
appendStringInfoString(buf, "UNBOUNDED PRECEDING ");
else if (wc->frameOptions & FRAMEOPTION_START_CURRENT_ROW)
else if (frameOptions & FRAMEOPTION_START_CURRENT_ROW)
appendStringInfoString(buf, "CURRENT ROW ");
else if (wc->frameOptions & FRAMEOPTION_START_OFFSET)
else if (frameOptions & FRAMEOPTION_START_OFFSET)
{
get_rule_expr(wc->startOffset, context, false);
if (wc->frameOptions & FRAMEOPTION_START_OFFSET_PRECEDING)
get_rule_expr(startOffset, context, false);
if (frameOptions & FRAMEOPTION_START_OFFSET_PRECEDING)
appendStringInfoString(buf, " PRECEDING ");
else if (wc->frameOptions & FRAMEOPTION_START_OFFSET_FOLLOWING)
else if (frameOptions & FRAMEOPTION_START_OFFSET_FOLLOWING)
appendStringInfoString(buf, " FOLLOWING ");
else
Assert(false);
}
else
Assert(false);
if (wc->frameOptions & FRAMEOPTION_BETWEEN)
if (frameOptions & FRAMEOPTION_BETWEEN)
{
appendStringInfoString(buf, "AND ");
if (wc->frameOptions & FRAMEOPTION_END_UNBOUNDED_FOLLOWING)
if (frameOptions & FRAMEOPTION_END_UNBOUNDED_FOLLOWING)
appendStringInfoString(buf, "UNBOUNDED FOLLOWING ");
else if (wc->frameOptions & FRAMEOPTION_END_CURRENT_ROW)
else if (frameOptions & FRAMEOPTION_END_CURRENT_ROW)
appendStringInfoString(buf, "CURRENT ROW ");
else if (wc->frameOptions & FRAMEOPTION_END_OFFSET)
else if (frameOptions & FRAMEOPTION_END_OFFSET)
{
get_rule_expr(wc->endOffset, context, false);
if (wc->frameOptions & FRAMEOPTION_END_OFFSET_PRECEDING)
get_rule_expr(endOffset, context, false);
if (frameOptions & FRAMEOPTION_END_OFFSET_PRECEDING)
appendStringInfoString(buf, " PRECEDING ");
else if (wc->frameOptions & FRAMEOPTION_END_OFFSET_FOLLOWING)
else if (frameOptions & FRAMEOPTION_END_OFFSET_FOLLOWING)
appendStringInfoString(buf, " FOLLOWING ");
else
Assert(false);
@ -3295,16 +3317,15 @@ get_rule_windowspec(WindowClause *wc, List *targetList,
else
Assert(false);
}
if (wc->frameOptions & FRAMEOPTION_EXCLUDE_CURRENT_ROW)
if (frameOptions & FRAMEOPTION_EXCLUDE_CURRENT_ROW)
appendStringInfoString(buf, "EXCLUDE CURRENT ROW ");
else if (wc->frameOptions & FRAMEOPTION_EXCLUDE_GROUP)
else if (frameOptions & FRAMEOPTION_EXCLUDE_GROUP)
appendStringInfoString(buf, "EXCLUDE GROUP ");
else if (wc->frameOptions & FRAMEOPTION_EXCLUDE_TIES)
else if (frameOptions & FRAMEOPTION_EXCLUDE_TIES)
appendStringInfoString(buf, "EXCLUDE TIES ");
/* we will now have a trailing space; remove it */
buf->len--;
buf->data[--(buf->len)] = '\0';
}
appendStringInfoChar(buf, ')');
}
/* ----------
@ -7612,6 +7633,9 @@ get_windowfunc_expr_helper(WindowFunc *wfunc, deparse_context *context,
appendStringInfoString(buf, ") OVER ");
if (context->windowClause)
{
/* Query-decompilation case: search the windowClause list */
foreach(l, context->windowClause)
{
WindowClause *wc = (WindowClause *) lfirst(l);
@ -7626,16 +7650,33 @@ get_windowfunc_expr_helper(WindowFunc *wfunc, deparse_context *context,
}
}
if (l == NULL)
{
if (context->windowClause)
elog(ERROR, "could not find window clause for winref %u",
wfunc->winref);
}
else
{
/*
* In EXPLAIN, we don't have window context information available, so
* we have to settle for this:
* In EXPLAIN, search the namespace stack for a matching WindowAgg
* node (probably it's always the first entry), and print winname.
*/
appendStringInfoString(buf, "(?)");
foreach(l, context->namespaces)
{
deparse_namespace *dpns = (deparse_namespace *) lfirst(l);
if (dpns->plan && IsA(dpns->plan, WindowAgg))
{
WindowAgg *wagg = (WindowAgg *) dpns->plan;
if (wagg->winref == wfunc->winref)
{
appendStringInfoString(buf, quote_identifier(wagg->winname));
break;
}
}
}
if (l == NULL)
elog(ERROR, "could not find window clause for winref %u",
wfunc->winref);
}
}