#include "optimizer/optimizer.h"
#include "parser/parse_agg.h"
#include "parser/parse_func.h"
-#include "parser/parse_node.h"
#include "parser/parse_oper.h"
#include "parser/parse_relation.h"
#include "parser/parser.h"
{
StringInfo buf; /* output buffer to append to */
List *namespaces; /* List of deparse_namespace nodes */
+ TupleDesc resultDesc; /* if top level of a view, the view's tupdesc */
+ List *targetList; /* Current query level's SELECT targetlist */
List *windowClause; /* Current query level's WINDOW clause */
- List *windowTList; /* targetlist for resolving WINDOW clause */
int prettyFlags; /* enabling of pretty-print functions */
int wrapColumn; /* max line length, or -1 for no limit */
int indentLevel; /* current indent level for pretty-print */
bool varprefix; /* true to print prefixes on Vars */
- ParseExprKind special_exprkind; /* set only for exprkinds needing special
- * handling */
+ bool colNamesVisible; /* do we care about output column names? */
+ bool inGroupBy; /* deparsing GROUP BY clause? */
+ bool varInOrderBy; /* deparsing simple Var in ORDER BY? */
Bitmapset *appendparents; /* if not null, map child Vars of these relids
* back to the parent rel */
} deparse_context;
int prettyFlags, int wrapColumn, int startIndent);
static void get_values_def(List *values_lists, deparse_context *context);
static void get_with_clause(Query *query, deparse_context *context);
-static void get_select_query_def(Query *query, deparse_context *context,
- TupleDesc resultDesc, bool colNamesVisible);
-static void get_insert_query_def(Query *query, deparse_context *context,
- bool colNamesVisible);
-static void get_update_query_def(Query *query, deparse_context *context,
- bool colNamesVisible);
+static void get_select_query_def(Query *query, deparse_context *context);
+static void get_insert_query_def(Query *query, deparse_context *context);
+static void get_update_query_def(Query *query, deparse_context *context);
static void get_update_query_targetlist_def(Query *query, List *targetList,
deparse_context *context,
RangeTblEntry *rte);
-static void get_delete_query_def(Query *query, deparse_context *context,
- bool colNamesVisible);
-static void get_merge_query_def(Query *query, deparse_context *context,
- bool colNamesVisible);
+static void get_delete_query_def(Query *query, deparse_context *context);
+static void get_merge_query_def(Query *query, deparse_context *context);
static void get_utility_query_def(Query *query, deparse_context *context);
-static void get_basic_select_query(Query *query, deparse_context *context,
- TupleDesc resultDesc, bool colNamesVisible);
-static void get_target_list(List *targetList, deparse_context *context,
- TupleDesc resultDesc, bool colNamesVisible);
+static void get_basic_select_query(Query *query, deparse_context *context);
+static void get_target_list(List *targetList, deparse_context *context);
static void get_setop_query(Node *setOp, Query *query,
- deparse_context *context,
- TupleDesc resultDesc, bool colNamesVisible);
+ deparse_context *context);
static Node *get_rule_sortgroupclause(Index ref, List *tlist,
bool force_colno,
deparse_context *context);
static char *generate_function_name(Oid funcid, int nargs,
List *argnames, Oid *argtypes,
bool has_variadic, bool *use_variadic_p,
- ParseExprKind special_exprkind);
+ bool inGroupBy);
static char *generate_operator_name(Oid operid, Oid arg1, Oid arg2);
static void add_cast_to(StringInfo buf, Oid typid);
static char *generate_qualified_type_name(Oid typid);
/* Set up context with one-deep namespace stack */
context.buf = &buf;
context.namespaces = list_make1(&dpns);
+ context.resultDesc = NULL;
+ context.targetList = NIL;
context.windowClause = NIL;
- context.windowTList = NIL;
context.varprefix = true;
context.prettyFlags = GET_PRETTY_FLAGS(pretty);
context.wrapColumn = WRAP_COLUMN_DEFAULT;
context.indentLevel = PRETTYINDENT_STD;
- context.special_exprkind = EXPR_KIND_NONE;
+ context.colNamesVisible = true;
+ context.inGroupBy = false;
+ context.varInOrderBy = false;
context.appendparents = NULL;
get_rule_expr(qual, &context, false);
appendStringInfo(&buf, "EXECUTE FUNCTION %s(",
generate_function_name(trigrec->tgfoid, 0,
NIL, NULL,
- false, NULL, EXPR_KIND_NONE));
+ false, NULL, false));
if (trigrec->tgnargs > 0)
{
appendStringInfo(&buf, " SUPPORT %s",
generate_function_name(proc->prosupport, 1,
NIL, argtypes,
- false, NULL, EXPR_KIND_NONE));
+ false, NULL, false));
}
if (oldlen != buf.len)
initStringInfo(&buf);
context.buf = &buf;
context.namespaces = dpcontext;
+ context.resultDesc = NULL;
+ context.targetList = NIL;
context.windowClause = NIL;
- context.windowTList = NIL;
context.varprefix = forceprefix;
context.prettyFlags = prettyFlags;
context.wrapColumn = WRAP_COLUMN_DEFAULT;
context.indentLevel = startIndent;
- context.special_exprkind = EXPR_KIND_NONE;
+ context.colNamesVisible = true;
+ context.inGroupBy = false;
+ context.varInOrderBy = false;
context.appendparents = NULL;
get_rule_expr(expr, &context, showimplicit);
context.buf = buf;
context.namespaces = list_make1(&dpns);
+ context.resultDesc = NULL;
+ context.targetList = NIL;
context.windowClause = NIL;
- context.windowTList = NIL;
context.varprefix = (list_length(query->rtable) != 1);
context.prettyFlags = prettyFlags;
context.wrapColumn = WRAP_COLUMN_DEFAULT;
context.indentLevel = PRETTYINDENT_STD;
- context.special_exprkind = EXPR_KIND_NONE;
+ context.colNamesVisible = true;
+ context.inGroupBy = false;
+ context.varInOrderBy = false;
context.appendparents = NULL;
set_deparse_for_query(&dpns, query, NIL);
context.buf = buf;
context.namespaces = lcons(&dpns, list_copy(parentnamespace));
+ context.resultDesc = NULL;
+ context.targetList = NIL;
context.windowClause = NIL;
- context.windowTList = NIL;
context.varprefix = (parentnamespace != NIL ||
list_length(query->rtable) != 1);
context.prettyFlags = prettyFlags;
context.wrapColumn = wrapColumn;
context.indentLevel = startIndent;
- context.special_exprkind = EXPR_KIND_NONE;
+ context.colNamesVisible = colNamesVisible;
+ context.inGroupBy = false;
+ context.varInOrderBy = false;
context.appendparents = NULL;
set_deparse_for_query(&dpns, query, parentnamespace);
switch (query->commandType)
{
case CMD_SELECT:
- get_select_query_def(query, &context, resultDesc, colNamesVisible);
+ /* We set context.resultDesc only if it's a SELECT */
+ context.resultDesc = resultDesc;
+ get_select_query_def(query, &context);
break;
case CMD_UPDATE:
- get_update_query_def(query, &context, colNamesVisible);
+ get_update_query_def(query, &context);
break;
case CMD_INSERT:
- get_insert_query_def(query, &context, colNamesVisible);
+ get_insert_query_def(query, &context);
break;
case CMD_DELETE:
- get_delete_query_def(query, &context, colNamesVisible);
+ get_delete_query_def(query, &context);
break;
case CMD_MERGE:
- get_merge_query_def(query, &context, colNamesVisible);
+ get_merge_query_def(query, &context);
break;
case CMD_NOTHING:
* ----------
*/
static void
-get_select_query_def(Query *query, deparse_context *context,
- TupleDesc resultDesc, bool colNamesVisible)
+get_select_query_def(Query *query, deparse_context *context)
{
StringInfo buf = context->buf;
- List *save_windowclause;
- List *save_windowtlist;
bool force_colno;
ListCell *l;
/* Insert the WITH clause if given */
get_with_clause(query, context);
- /* Set up context for possible window functions */
- save_windowclause = context->windowClause;
+ /* Subroutines may need to consult the SELECT targetlist and windowClause */
+ context->targetList = query->targetList;
context->windowClause = query->windowClause;
- save_windowtlist = context->windowTList;
- context->windowTList = query->targetList;
/*
* If the Query node has a setOperations tree, then it's the top level of
*/
if (query->setOperations)
{
- get_setop_query(query->setOperations, query, context, resultDesc,
- colNamesVisible);
+ get_setop_query(query->setOperations, query, context);
/* ORDER BY clauses must be simple in this case */
force_colno = true;
}
else
{
- get_basic_select_query(query, context, resultDesc, colNamesVisible);
+ get_basic_select_query(query, context);
force_colno = false;
}
appendStringInfoString(buf, " SKIP LOCKED");
}
}
-
- context->windowClause = save_windowclause;
- context->windowTList = save_windowtlist;
}
/*
}
static void
-get_basic_select_query(Query *query, deparse_context *context,
- TupleDesc resultDesc, bool colNamesVisible)
+get_basic_select_query(Query *query, deparse_context *context)
{
StringInfo buf = context->buf;
RangeTblEntry *values_rte;
* VALUES part. This reverses what transformValuesClause() did at parse
* time.
*/
- values_rte = get_simple_values_rte(query, resultDesc);
+ values_rte = get_simple_values_rte(query, context->resultDesc);
if (values_rte)
{
get_values_def(values_rte->values_lists, context);
}
/* Then we tell what to select (the targetlist) */
- get_target_list(query->targetList, context, resultDesc, colNamesVisible);
+ get_target_list(query->targetList, context);
/* Add the FROM clause if needed */
get_from_clause(query, " FROM ", context);
/* Add the GROUP BY clause if given */
if (query->groupClause != NULL || query->groupingSets != NULL)
{
- ParseExprKind save_exprkind;
+ bool save_ingroupby;
appendContextKeyword(context, " GROUP BY ",
-PRETTYINDENT_STD, PRETTYINDENT_STD, 1);
if (query->groupDistinct)
appendStringInfoString(buf, "DISTINCT ");
- save_exprkind = context->special_exprkind;
- context->special_exprkind = EXPR_KIND_GROUP_BY;
+ save_ingroupby = context->inGroupBy;
+ context->inGroupBy = true;
if (query->groupingSets == NIL)
{
}
}
- context->special_exprkind = save_exprkind;
+ context->inGroupBy = save_ingroupby;
}
/* Add the HAVING clause if given */
* get_target_list - Parse back a SELECT target list
*
* This is also used for RETURNING lists in INSERT/UPDATE/DELETE/MERGE.
- *
- * resultDesc and colNamesVisible are as for get_query_def()
* ----------
*/
static void
-get_target_list(List *targetList, deparse_context *context,
- TupleDesc resultDesc, bool colNamesVisible)
+get_target_list(List *targetList, deparse_context *context)
{
StringInfo buf = context->buf;
StringInfoData targetbuf;
* assigned column name explicitly. Otherwise, show it only if
* it's not FigureColname's fallback.
*/
- attname = colNamesVisible ? NULL : "?column?";
+ attname = context->colNamesVisible ? NULL : "?column?";
}
/*
* effects of any column RENAME that's been done on the view).
* Otherwise, just use what we can find in the TLE.
*/
- if (resultDesc && colno <= resultDesc->natts)
- colname = NameStr(TupleDescAttr(resultDesc, colno - 1)->attname);
+ if (context->resultDesc && colno <= context->resultDesc->natts)
+ colname = NameStr(TupleDescAttr(context->resultDesc,
+ colno - 1)->attname);
else
colname = tle->resname;
}
static void
-get_setop_query(Node *setOp, Query *query, deparse_context *context,
- TupleDesc resultDesc, bool colNamesVisible)
+get_setop_query(Node *setOp, Query *query, deparse_context *context)
{
StringInfo buf = context->buf;
bool need_paren;
subquery->limitCount);
if (need_paren)
appendStringInfoChar(buf, '(');
- get_query_def(subquery, buf, context->namespaces, resultDesc,
- colNamesVisible,
+ get_query_def(subquery, buf, context->namespaces,
+ context->resultDesc, context->colNamesVisible,
context->prettyFlags, context->wrapColumn,
context->indentLevel);
if (need_paren)
{
SetOperationStmt *op = (SetOperationStmt *) setOp;
int subindent;
+ bool save_colnamesvisible;
/*
* We force parens when nesting two SetOperationStmts, except when the
else
subindent = 0;
- get_setop_query(op->larg, query, context, resultDesc, colNamesVisible);
+ get_setop_query(op->larg, query, context);
if (need_paren)
appendContextKeyword(context, ") ", -subindent, 0, 0);
subindent = 0;
appendContextKeyword(context, "", subindent, 0, 0);
- get_setop_query(op->rarg, query, context, resultDesc, false);
+ /*
+ * The output column names of the RHS sub-select don't matter.
+ */
+ save_colnamesvisible = context->colNamesVisible;
+ context->colNamesVisible = false;
+
+ get_setop_query(op->rarg, query, context);
+
+ context->colNamesVisible = save_colnamesvisible;
if (PRETTY_INDENT(context))
context->indentLevel -= subindent;
* Use column-number form if requested by caller. Otherwise, if
* expression is a constant, force it to be dumped with an explicit cast
* as decoration --- this is because a simple integer constant is
- * ambiguous (and will be misinterpreted by findTargetlistEntry()) if we
- * dump it without any decoration. If it's anything more complex than a
- * simple Var, then force extra parens around it, to ensure it can't be
- * misinterpreted as a cube() or rollup() construct.
+ * ambiguous (and will be misinterpreted by findTargetlistEntrySQL92()) if
+ * we dump it without any decoration. Similarly, if it's just a Var,
+ * there is risk of misinterpretation if the column name is reassigned in
+ * the SELECT list, so we may need to force table qualification. And, if
+ * it's anything more complex than a simple Var, then force extra parens
+ * around it, to ensure it can't be misinterpreted as a cube() or rollup()
+ * construct.
*/
if (force_colno)
{
Assert(!tle->resjunk);
appendStringInfo(buf, "%d", tle->resno);
}
- else if (expr && IsA(expr, Const))
+ else if (!expr)
+ /* do nothing, probably can't happen */ ;
+ else if (IsA(expr, Const))
get_const_expr((Const *) expr, context, 1);
- else if (!expr || IsA(expr, Var))
- get_rule_expr(expr, context, true);
+ else if (IsA(expr, Var))
+ {
+ /* Tell get_variable to check for name conflict */
+ bool save_varinorderby = context->varInOrderBy;
+
+ context->varInOrderBy = true;
+ (void) get_variable((Var *) expr, 0, false, context);
+ context->varInOrderBy = save_varinorderby;
+ }
else
{
/*
* ----------
*/
static void
-get_insert_query_def(Query *query, deparse_context *context,
- bool colNamesVisible)
+get_insert_query_def(Query *query, deparse_context *context)
{
StringInfo buf = context->buf;
RangeTblEntry *select_rte = NULL;
{
appendContextKeyword(context, " RETURNING",
-PRETTYINDENT_STD, PRETTYINDENT_STD, 1);
- get_target_list(query->returningList, context, NULL, colNamesVisible);
+ get_target_list(query->returningList, context);
}
}
* ----------
*/
static void
-get_update_query_def(Query *query, deparse_context *context,
- bool colNamesVisible)
+get_update_query_def(Query *query, deparse_context *context)
{
StringInfo buf = context->buf;
RangeTblEntry *rte;
{
appendContextKeyword(context, " RETURNING",
-PRETTYINDENT_STD, PRETTYINDENT_STD, 1);
- get_target_list(query->returningList, context, NULL, colNamesVisible);
+ get_target_list(query->returningList, context);
}
}
* ----------
*/
static void
-get_delete_query_def(Query *query, deparse_context *context,
- bool colNamesVisible)
+get_delete_query_def(Query *query, deparse_context *context)
{
StringInfo buf = context->buf;
RangeTblEntry *rte;
{
appendContextKeyword(context, " RETURNING",
-PRETTYINDENT_STD, PRETTYINDENT_STD, 1);
- get_target_list(query->returningList, context, NULL, colNamesVisible);
+ get_target_list(query->returningList, context);
}
}
* ----------
*/
static void
-get_merge_query_def(Query *query, deparse_context *context,
- bool colNamesVisible)
+get_merge_query_def(Query *query, deparse_context *context)
{
StringInfo buf = context->buf;
RangeTblEntry *rte;
{
appendContextKeyword(context, " RETURNING",
-PRETTYINDENT_STD, PRETTYINDENT_STD, 1);
- get_target_list(query->returningList, context, NULL, colNamesVisible);
+ get_target_list(query->returningList, context);
}
}
deparse_columns *colinfo;
char *refname;
char *attname;
+ bool need_prefix;
/* Find appropriate nesting depth */
netlevelsup = var->varlevelsup + levelsup;
attname = get_rte_attribute_name(rte, attnum);
}
- if (refname && (context->varprefix || attname == NULL))
+ need_prefix = (context->varprefix || attname == NULL);
+
+ /*
+ * If we're considering a plain Var in an ORDER BY (but not GROUP BY)
+ * clause, we may need to add a table-name prefix to prevent
+ * findTargetlistEntrySQL92 from misinterpreting the name as an
+ * output-column name. To avoid cluttering the output with unnecessary
+ * prefixes, do so only if there is a name match to a SELECT tlist item
+ * that is different from the Var.
+ */
+ if (context->varInOrderBy && !context->inGroupBy && !need_prefix)
+ {
+ int colno = 0;
+
+ foreach_node(TargetEntry, tle, context->targetList)
+ {
+ char *colname;
+
+ if (tle->resjunk)
+ continue; /* ignore junk entries */
+ colno++;
+
+ /* This must match colname-choosing logic in get_target_list() */
+ if (context->resultDesc && colno <= context->resultDesc->natts)
+ colname = NameStr(TupleDescAttr(context->resultDesc,
+ colno - 1)->attname);
+ else
+ colname = tle->resname;
+
+ if (colname && strcmp(colname, attname) == 0 &&
+ !equal(var, tle->expr))
+ {
+ need_prefix = true;
+ break;
+ }
+ }
+ }
+
+ if (refname && need_prefix)
{
appendStringInfoString(buf, quote_identifier(refname));
appendStringInfoChar(buf, '.');
argnames, argtypes,
expr->funcvariadic,
&use_variadic,
- context->special_exprkind));
+ context->inGroupBy));
nargs = 0;
foreach(l, expr->args)
{
funcname = generate_function_name(aggref->aggfnoid, nargs, NIL,
argtypes, aggref->aggvariadic,
&use_variadic,
- context->special_exprkind);
+ context->inGroupBy);
/* Print the aggregate name, schema-qualified if needed */
appendStringInfo(buf, "%s(%s", funcname,
if (!funcname)
funcname = generate_function_name(wfunc->winfnoid, nargs, argnames,
argtypes, false, NULL,
- context->special_exprkind);
+ context->inGroupBy);
appendStringInfo(buf, "%s(", funcname);
if (wc->name)
appendStringInfoString(buf, quote_identifier(wc->name));
else
- get_rule_windowspec(wc, context->windowTList, context);
+ get_rule_windowspec(wc, context->targetList, context);
break;
}
}
appendStringInfo(buf, " TABLESAMPLE %s (",
generate_function_name(tablesample->tsmhandler, 1,
NIL, argtypes,
- false, NULL, EXPR_KIND_NONE));
+ false, NULL, false));
nargs = 0;
foreach(l, tablesample->args)
* the output. For non-FuncExpr cases, has_variadic should be false and
* use_variadic_p can be NULL.
*
+ * inGroupBy must be true if we're deparsing a GROUP BY clause.
+ *
* The result includes all necessary quoting and schema-prefixing.
*/
static char *
generate_function_name(Oid funcid, int nargs, List *argnames, Oid *argtypes,
bool has_variadic, bool *use_variadic_p,
- ParseExprKind special_exprkind)
+ bool inGroupBy)
{
char *result;
HeapTuple proctup;
/*
* Due to parser hacks to avoid needing to reserve CUBE, we need to force
- * qualification in some special cases.
+ * qualification of some function names within GROUP BY.
*/
- if (special_exprkind == EXPR_KIND_GROUP_BY)
+ if (inGroupBy)
{
if (strcmp(proname, "cube") == 0 || strcmp(proname, "rollup") == 0)
force_qualify = true;
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