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postgres_deparse.c
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postgres_deparse.c
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#include "postgres.h"
#include "catalog/index.h"
#include "catalog/pg_am.h"
#include "catalog/pg_attribute.h"
#include "catalog/pg_class.h"
#include "catalog/pg_trigger.h"
#include "commands/trigger.h"
#include "common/keywords.h"
#include "common/kwlookup.h"
#include "lib/stringinfo.h"
#include "nodes/nodes.h"
#include "nodes/parsenodes.h"
#include "nodes/pg_list.h"
#include "utils/builtins.h"
#include "utils/datetime.h"
#include "utils/timestamp.h"
#include "utils/xml.h"
typedef enum DeparseNodeContext {
DEPARSE_NODE_CONTEXT_NONE,
// Parent node type (and sometimes field)
DEPARSE_NODE_CONTEXT_INSERT_RELATION,
DEPARSE_NODE_CONTEXT_INSERT_ON_CONFLICT,
DEPARSE_NODE_CONTEXT_UPDATE,
DEPARSE_NODE_CONTEXT_RETURNING,
DEPARSE_NODE_CONTEXT_A_EXPR,
DEPARSE_NODE_CONTEXT_XMLATTRIBUTES,
DEPARSE_NODE_CONTEXT_XMLNAMESPACES,
DEPARSE_NODE_CONTEXT_CREATE_TYPE,
DEPARSE_NODE_CONTEXT_ALTER_TYPE,
DEPARSE_NODE_CONTEXT_SET_STATEMENT,
// Identifier vs constant context
DEPARSE_NODE_CONTEXT_IDENTIFIER,
DEPARSE_NODE_CONTEXT_CONSTANT
} DeparseNodeContext;
static void
removeTrailingSpace(StringInfo str)
{
if (str->len >= 1 && str->data[str->len - 1] == ' ') {
str->len -= 1;
str->data[str->len] = '\0';
}
}
/*
* Append a SQL string literal representing "val" to buf.
*
* Copied here from postgres_fdw/deparse.c to avoid adding
* many additional dependencies.
*/
static void
deparseStringLiteral(StringInfo buf, const char *val)
{
const char *valptr;
/*
* Rather than making assumptions about the remote server's value of
* standard_conforming_strings, always use E'foo' syntax if there are any
* backslashes. This will fail on remote servers before 8.1, but those
* are long out of support.
*/
if (strchr(val, '\\') != NULL)
appendStringInfoChar(buf, ESCAPE_STRING_SYNTAX);
appendStringInfoChar(buf, '\'');
for (valptr = val; *valptr; valptr++)
{
char ch = *valptr;
if (SQL_STR_DOUBLE(ch, true))
appendStringInfoChar(buf, ch);
appendStringInfoChar(buf, ch);
}
appendStringInfoChar(buf, '\'');
}
// Check whether the value is a reserved keyword, to determine escaping for output
//
// Note that since the parser lowercases all keywords, this does *not* match when the
// value is not all-lowercase and a reserved keyword.
static bool
isReservedKeyword(const char *val)
{
int kwnum = ScanKeywordLookup(val, &ScanKeywords);
bool all_lower_case = true;
const char *cp;
for (cp = val; *cp; cp++)
{
if (!(
(*cp >= 'a' && *cp <= 'z') ||
(*cp >= '0' && *cp <= '9') ||
(*cp == '_')))
{
all_lower_case = false;
break;
}
}
return all_lower_case && kwnum >= 0 && ScanKeywordCategories[kwnum] == RESERVED_KEYWORD;
}
// Returns whether the given value consists only of operator characters
static bool
isOp(const char *val)
{
const char *cp;
Assert(strlen(val) > 0);
for (cp = val; *cp; cp++)
{
if (!(
*cp == '~' ||
*cp == '!' ||
*cp == '@' ||
*cp == '#' ||
*cp == '^' ||
*cp == '&' ||
*cp == '|' ||
*cp == '`' ||
*cp == '?' ||
*cp == '+' ||
*cp == '-' ||
*cp == '*' ||
*cp == '/' ||
*cp == '%' ||
*cp == '<' ||
*cp == '>' ||
*cp == '='))
return false;
}
return true;
}
static void deparseSelectStmt(StringInfo str, SelectStmt *stmt);
static void deparseIntoClause(StringInfo str, IntoClause *into_clause);
static void deparseRangeVar(StringInfo str, RangeVar *range_var, DeparseNodeContext context);
static void deparseResTarget(StringInfo str, ResTarget *res_target, DeparseNodeContext context);
void deparseRawStmt(StringInfo str, RawStmt *raw_stmt);
static void deparseAlias(StringInfo str, Alias *alias);
static void deparseWindowDef(StringInfo str, WindowDef* window_def);
static void deparseColumnRef(StringInfo str, ColumnRef* column_ref);
static void deparseSubLink(StringInfo str, SubLink* sub_link);
static void deparseAExpr(StringInfo str, A_Expr* a_expr, DeparseNodeContext context);
static void deparseBoolExpr(StringInfo str, BoolExpr *bool_expr);
static void deparseAStar(StringInfo str, A_Star* a_star);
static void deparseCollateClause(StringInfo str, CollateClause* collate_clause);
static void deparseSortBy(StringInfo str, SortBy* sort_by);
static void deparseParamRef(StringInfo str, ParamRef* param_ref);
static void deparseSQLValueFunction(StringInfo str, SQLValueFunction* sql_value_function);
static void deparseWithClause(StringInfo str, WithClause *with_clause);
static void deparseJoinExpr(StringInfo str, JoinExpr *join_expr);
static void deparseCommonTableExpr(StringInfo str, CommonTableExpr *cte);
static void deparseRangeSubselect(StringInfo str, RangeSubselect *range_subselect);
static void deparseRangeFunction(StringInfo str, RangeFunction *range_func);
static void deparseAArrayExpr(StringInfo str, A_ArrayExpr * array_expr);
static void deparseRowExpr(StringInfo str, RowExpr *row_expr);
static void deparseTypeCast(StringInfo str, TypeCast *type_cast, DeparseNodeContext context);
static void deparseTypeName(StringInfo str, TypeName *type_name);
static void deparseIntervalTypmods(StringInfo str, TypeName *type_name);
static void deparseNullTest(StringInfo str, NullTest *null_test);
static void deparseCaseExpr(StringInfo str, CaseExpr *case_expr);
static void deparseCaseWhen(StringInfo str, CaseWhen *case_when);
static void deparseAIndirection(StringInfo str, A_Indirection *a_indirection);
static void deparseAIndices(StringInfo str, A_Indices *a_indices);
static void deparseCoalesceExpr(StringInfo str, CoalesceExpr *coalesce_expr);
static void deparseBooleanTest(StringInfo str, BooleanTest *boolean_test);
static void deparseColumnDef(StringInfo str, ColumnDef *column_def);
static void deparseInsertStmt(StringInfo str, InsertStmt *insert_stmt);
static void deparseOnConflictClause(StringInfo str, OnConflictClause *on_conflict_clause);
static void deparseIndexElem(StringInfo str, IndexElem* index_elem);
static void deparseUpdateStmt(StringInfo str, UpdateStmt *update_stmt);
static void deparseDeleteStmt(StringInfo str, DeleteStmt *delete_stmt);
static void deparseLockingClause(StringInfo str, LockingClause *locking_clause);
static void deparseSetToDefault(StringInfo str, SetToDefault *set_to_default);
static void deparseCreateCastStmt(StringInfo str, CreateCastStmt *create_cast_stmt);
static void deparseCreateDomainStmt(StringInfo str, CreateDomainStmt *create_domain_stmt);
static void deparseFunctionParameter(StringInfo str, FunctionParameter *function_parameter);
static void deparseRoleSpec(StringInfo str, RoleSpec *role_spec);
static void deparseViewStmt(StringInfo str, ViewStmt *view_stmt);
static void deparseVariableSetStmt(StringInfo str, VariableSetStmt* variable_set_stmt);
static void deparseReplicaIdentityStmt(StringInfo str, ReplicaIdentityStmt *replica_identity_stmt);
static void deparseRangeTableSample(StringInfo str, RangeTableSample *range_table_sample);
static void deparseRangeTableFunc(StringInfo str, RangeTableFunc* range_table_func);
static void deparseGroupingSet(StringInfo str, GroupingSet *grouping_set);
static void deparseFuncCall(StringInfo str, FuncCall *func_call);
static void deparseMinMaxExpr(StringInfo str, MinMaxExpr *min_max_expr);
static void deparseXmlExpr(StringInfo str, XmlExpr* xml_expr);
static void deparseXmlSerialize(StringInfo str, XmlSerialize *xml_serialize);
static void deparseConstraint(StringInfo str, Constraint *constraint);
static void deparseSchemaStmt(StringInfo str, Node *node);
static void deparseExecuteStmt(StringInfo str, ExecuteStmt *execute_stmt);
static void deparseTriggerTransition(StringInfo str, TriggerTransition *trigger_transition);
static void deparseCreateOpClassItem(StringInfo str, CreateOpClassItem *create_op_class_item);
static void deparseAConst(StringInfo str, A_Const *a_const);
static void deparseCurrentOfExpr(StringInfo str, CurrentOfExpr *current_of_expr);
static void deparseGroupingFunc(StringInfo str, GroupingFunc *grouping_func);
static void deparsePreparableStmt(StringInfo str, Node *node);
static void deparseRuleActionStmt(StringInfo str, Node *node);
static void deparseExplainableStmt(StringInfo str, Node *node);
static void deparseStmt(StringInfo str, Node *node);
static void deparseValue(StringInfo str, union ValUnion *value, DeparseNodeContext context);
// "any_name" in gram.y
static void deparseAnyName(StringInfo str, List *parts)
{
ListCell *lc = NULL;
foreach(lc, parts)
{
Assert(IsA(lfirst(lc), String));
appendStringInfoString(str, quote_identifier(strVal(lfirst(lc))));
if (lnext(parts, lc))
appendStringInfoChar(str, '.');
}
}
static void deparseAnyNameSkipFirst(StringInfo str, List *parts)
{
ListCell *lc = NULL;
for_each_from(lc, parts, 1)
{
Assert(IsA(lfirst(lc), String));
appendStringInfoString(str, quote_identifier(strVal(lfirst(lc))));
if (lnext(parts, lc))
appendStringInfoChar(str, '.');
}
}
static void deparseAnyNameSkipLast(StringInfo str, List *parts)
{
ListCell *lc = NULL;
foreach (lc, parts)
{
if (lnext(parts, lc))
{
appendStringInfoString(str, quote_identifier(strVal(lfirst(lc))));
if (foreach_current_index(lc) < list_length(parts) - 2)
appendStringInfoChar(str, '.');
}
}
}
// "a_expr" / "b_expr" in gram.y
static void deparseExpr(StringInfo str, Node *node)
{
if (node == NULL)
return;
switch (nodeTag(node))
{
case T_FuncCall:
deparseFuncCall(str, castNode(FuncCall, node));
break;
case T_XmlExpr:
deparseXmlExpr(str, castNode(XmlExpr, node));
break;
case T_TypeCast:
deparseTypeCast(str, castNode(TypeCast, node), DEPARSE_NODE_CONTEXT_NONE);
break;
case T_A_Const:
deparseAConst(str, castNode(A_Const, node));
break;
case T_ColumnRef:
deparseColumnRef(str, castNode(ColumnRef, node));
break;
case T_A_Expr:
deparseAExpr(str, castNode(A_Expr, node), DEPARSE_NODE_CONTEXT_NONE);
break;
case T_CaseExpr:
deparseCaseExpr(str, castNode(CaseExpr, node));
break;
case T_A_ArrayExpr:
deparseAArrayExpr(str, castNode(A_ArrayExpr, node));
break;
case T_NullTest:
deparseNullTest(str, castNode(NullTest, node));
break;
case T_XmlSerialize:
deparseXmlSerialize(str, castNode(XmlSerialize, node));
break;
case T_ParamRef:
deparseParamRef(str, castNode(ParamRef, node));
break;
case T_BoolExpr:
deparseBoolExpr(str, castNode(BoolExpr, node));
break;
case T_SubLink:
deparseSubLink(str, castNode(SubLink, node));
break;
case T_RowExpr:
deparseRowExpr(str, castNode(RowExpr, node));
break;
case T_CoalesceExpr:
deparseCoalesceExpr(str, castNode(CoalesceExpr, node));
break;
case T_SetToDefault:
deparseSetToDefault(str, castNode(SetToDefault, node));
break;
case T_A_Indirection:
deparseAIndirection(str, castNode(A_Indirection, node));
break;
case T_CollateClause:
deparseCollateClause(str, castNode(CollateClause, node));
break;
case T_CurrentOfExpr:
deparseCurrentOfExpr(str, castNode(CurrentOfExpr, node));
break;
case T_SQLValueFunction:
deparseSQLValueFunction(str, castNode(SQLValueFunction, node));
break;
case T_MinMaxExpr:
deparseMinMaxExpr(str, castNode(MinMaxExpr, node));
break;
case T_BooleanTest:
deparseBooleanTest(str, castNode(BooleanTest, node));
break;
case T_GroupingFunc:
deparseGroupingFunc(str, castNode(GroupingFunc, node));
break;
default:
elog(ERROR, "deparse: unpermitted node type in a_expr/b_expr: %d",
(int) nodeTag(node));
break;
}
}
// "c_expr" in gram.y
static void deparseCExpr(StringInfo str, Node *node)
{
switch (nodeTag(node))
{
case T_ColumnRef:
deparseColumnRef(str, castNode(ColumnRef, node));
break;
case T_A_Const:
deparseAConst(str, castNode(A_Const, node));
break;
case T_TypeCast:
deparseTypeCast(str, castNode(TypeCast, node), DEPARSE_NODE_CONTEXT_NONE);
break;
case T_A_Expr:
appendStringInfoChar(str, '(');
deparseAExpr(str, castNode(A_Expr, node), DEPARSE_NODE_CONTEXT_NONE);
appendStringInfoChar(str, ')');
break;
case T_ParamRef:
deparseParamRef(str, castNode(ParamRef, node));
break;
case T_A_Indirection:
deparseAIndirection(str, castNode(A_Indirection, node));
break;
case T_CaseExpr:
deparseCaseExpr(str, castNode(CaseExpr, node));
break;
case T_FuncCall:
deparseFuncCall(str, castNode(FuncCall, node));
break;
case T_SubLink:
deparseSubLink(str, castNode(SubLink, node));
break;
case T_A_ArrayExpr:
deparseAArrayExpr(str, castNode(A_ArrayExpr, node));
break;
case T_RowExpr:
deparseRowExpr(str, castNode(RowExpr, node));
break;
case T_GroupingFunc:
deparseGroupingFunc(str, castNode(GroupingFunc, node));
break;
default:
elog(ERROR, "deparse: unpermitted node type in c_expr: %d",
(int) nodeTag(node));
break;
}
}
// "expr_list" in gram.y
static void deparseExprList(StringInfo str, List *exprs)
{
ListCell *lc;
foreach(lc, exprs)
{
deparseExpr(str, lfirst(lc));
if (lnext(exprs, lc))
appendStringInfoString(str, ", ");
}
}
// "ColId", "name", "database_name", "access_method" and "index_name" in gram.y
static void deparseColId(StringInfo str, char *s)
{
appendStringInfoString(str, quote_identifier(s));
}
// "ColLabel", "attr_name"
//
// Note this is kept separate from ColId in case we ever want to be more
// specific on how to handle keywords here
static void deparseColLabel(StringInfo str, char *s)
{
appendStringInfoString(str, quote_identifier(s));
}
// "SignedIconst" and "Iconst" in gram.y
static void deparseSignedIconst(StringInfo str, Node *node)
{
appendStringInfo(str, "%d", intVal(node));
}
// "indirection" and "opt_indirection" in gram.y
static void deparseOptIndirection(StringInfo str, List *indirection, int N)
{
ListCell *lc = NULL;
for_each_from(lc, indirection, N)
{
if (IsA(lfirst(lc), String))
{
appendStringInfoChar(str, '.');
deparseColLabel(str, strVal(lfirst(lc)));
}
else if (IsA(lfirst(lc), A_Star))
{
appendStringInfoString(str, ".*");
}
else if (IsA(lfirst(lc), A_Indices))
{
deparseAIndices(str, castNode(A_Indices, lfirst(lc)));
}
else
{
// No other nodes should appear here
Assert(false);
}
}
}
// "role_list" in gram.y
static void deparseRoleList(StringInfo str, List *roles)
{
ListCell *lc;
foreach(lc, roles)
{
RoleSpec *role_spec = castNode(RoleSpec, lfirst(lc));
deparseRoleSpec(str, role_spec);
if (lnext(roles, lc))
appendStringInfoString(str, ", ");
}
}
// "SimpleTypename" in gram.y
static void deparseSimpleTypename(StringInfo str, Node *node)
{
deparseTypeName(str, castNode(TypeName, node));
}
// "NumericOnly" in gram.y
static void deparseNumericOnly(StringInfo str, union ValUnion *value)
{
switch (nodeTag(value))
{
case T_Integer:
appendStringInfo(str, "%d", value->ival.ival);
break;
case T_Float:
appendStringInfoString(str, value->sval.sval);
break;
default:
Assert(false);
}
}
// "NumericOnly_list" in gram.y
static void deparseNumericOnlyList(StringInfo str, List *l)
{
ListCell *lc = NULL;
foreach(lc, l)
{
deparseNumericOnly(str, (union ValUnion *) lfirst(lc));
if (lnext(l, lc))
appendStringInfoString(str, ", ");
}
}
// "SeqOptElem" in gram.y
static void deparseSeqOptElem(StringInfo str, DefElem *def_elem)
{
ListCell *lc;
if (strcmp(def_elem->defname, "as") == 0)
{
appendStringInfoString(str, "AS ");
deparseSimpleTypename(str, def_elem->arg);
}
else if (strcmp(def_elem->defname, "cache") == 0)
{
appendStringInfoString(str, "CACHE ");
deparseNumericOnly(str, (union ValUnion *) def_elem->arg);
}
else if (strcmp(def_elem->defname, "cycle") == 0 && boolVal(def_elem->arg))
{
appendStringInfoString(str, "CYCLE");
}
else if (strcmp(def_elem->defname, "cycle") == 0 && !boolVal(def_elem->arg))
{
appendStringInfoString(str, "NO CYCLE");
}
else if (strcmp(def_elem->defname, "increment") == 0)
{
appendStringInfoString(str, "INCREMENT ");
deparseNumericOnly(str, (union ValUnion *) def_elem->arg);
}
else if (strcmp(def_elem->defname, "maxvalue") == 0 && def_elem->arg != NULL)
{
appendStringInfoString(str, "MAXVALUE ");
deparseNumericOnly(str, (union ValUnion *) def_elem->arg);
}
else if (strcmp(def_elem->defname, "maxvalue") == 0 && def_elem->arg == NULL)
{
appendStringInfoString(str, "NO MAXVALUE");
}
else if (strcmp(def_elem->defname, "minvalue") == 0 && def_elem->arg != NULL)
{
appendStringInfoString(str, "MINVALUE ");
deparseNumericOnly(str, (union ValUnion *) def_elem->arg);
}
else if (strcmp(def_elem->defname, "minvalue") == 0 && def_elem->arg == NULL)
{
appendStringInfoString(str, "NO MINVALUE");
}
else if (strcmp(def_elem->defname, "owned_by") == 0)
{
appendStringInfoString(str, "OWNED BY ");
deparseAnyName(str, castNode(List, def_elem->arg));
}
else if (strcmp(def_elem->defname, "sequence_name") == 0)
{
appendStringInfoString(str, "SEQUENCE NAME ");
deparseAnyName(str, castNode(List, def_elem->arg));
}
else if (strcmp(def_elem->defname, "start") == 0)
{
appendStringInfoString(str, "START ");
deparseNumericOnly(str, (union ValUnion *) def_elem->arg);
}
else if (strcmp(def_elem->defname, "restart") == 0 && def_elem->arg == NULL)
{
appendStringInfoString(str, "RESTART");
}
else if (strcmp(def_elem->defname, "restart") == 0 && def_elem->arg != NULL)
{
appendStringInfoString(str, "RESTART ");
deparseNumericOnly(str, (union ValUnion *) def_elem->arg);
}
else
{
Assert(false);
}
}
// "SeqOptList" in gram.y
static void deparseSeqOptList(StringInfo str, List *options)
{
ListCell *lc;
Assert(list_length(options) > 0);
foreach (lc, options)
{
deparseSeqOptElem(str, castNode(DefElem, lfirst(lc)));
appendStringInfoChar(str, ' ');
}
}
// "OptSeqOptList" in gram.y
static void deparseOptSeqOptList(StringInfo str, List *options)
{
if (list_length(options) > 0)
deparseSeqOptList(str, options);
}
// "OptParenthesizedSeqOptList" in gram.y
static void deparseOptParenthesizedSeqOptList(StringInfo str, List *options)
{
if (list_length(options) > 0)
{
appendStringInfoChar(str, '(');
deparseSeqOptList(str, options);
appendStringInfoChar(str, ')');
}
}
// "opt_drop_behavior" in gram.y
static void deparseOptDropBehavior(StringInfo str, DropBehavior behavior)
{
switch (behavior)
{
case DROP_RESTRICT:
// Default
break;
case DROP_CASCADE:
appendStringInfoString(str, "CASCADE ");
break;
}
}
// "any_operator" in gram.y
static void deparseAnyOperator(StringInfo str, List *op)
{
Assert(isOp(strVal(llast(op))));
if (list_length(op) == 2)
{
appendStringInfoString(str, quote_identifier(strVal(linitial(op))));
appendStringInfoChar(str, '.');
appendStringInfoString(str, strVal(llast(op)));
}
else if (list_length(op) == 1)
{
appendStringInfoString(str, strVal(llast(op)));
}
else
{
Assert(false);
}
}
// "qual_Op" and "qual_all_Op" in gram.y
static void deparseQualOp(StringInfo str, List *op)
{
if (list_length(op) == 1 && isOp(strVal(linitial(op))))
{
appendStringInfoString(str, strVal(linitial(op)));
}
else
{
appendStringInfoString(str, "OPERATOR(");
deparseAnyOperator(str, op);
appendStringInfoString(str, ")");
}
}
// "subquery_Op" in gram.y
static void deparseSubqueryOp(StringInfo str, List *op)
{
if (list_length(op) == 1 && strcmp(strVal(linitial(op)), "~~") == 0)
{
appendStringInfoString(str, "LIKE");
}
else if (list_length(op) == 1 && strcmp(strVal(linitial(op)), "!~~") == 0)
{
appendStringInfoString(str, "NOT LIKE");
}
else if (list_length(op) == 1 && strcmp(strVal(linitial(op)), "~~*") == 0)
{
appendStringInfoString(str, "ILIKE");
}
else if (list_length(op) == 1 && strcmp(strVal(linitial(op)), "!~~*") == 0)
{
appendStringInfoString(str, "NOT ILIKE");
}
else if (list_length(op) == 1 && isOp(strVal(linitial(op))))
{
appendStringInfoString(str, strVal(linitial(op)));
}
else
{
appendStringInfoString(str, "OPERATOR(");
deparseAnyOperator(str, op);
appendStringInfoString(str, ")");
}
}
// Not present directly in gram.y (usually matched by ColLabel)
static void deparseGenericDefElemName(StringInfo str, const char *in)
{
Assert(in != NULL);
char *val = pstrdup(in);
for (unsigned char *p = (unsigned char *) val; *p; p++)
*p = pg_toupper(*p);
appendStringInfoString(str, val);
pfree(val);
}
// "def_arg" and "operator_def_arg" in gram.y
static void deparseDefArg(StringInfo str, Node *arg, bool is_operator_def_arg)
{
if (IsA(arg, TypeName)) // func_type
{
deparseTypeName(str, castNode(TypeName, arg));
}
else if (IsA(arg, List)) // qual_all_Op
{
List *l = castNode(List, arg);
Assert(list_length(l) == 1 || list_length(l) == 2);
// Schema qualified operator
if (list_length(l) == 2)
{
appendStringInfoString(str, "OPERATOR(");
deparseAnyOperator(str, l);
appendStringInfoChar(str, ')');
}
else if (list_length(l) == 1)
{
appendStringInfoString(str, strVal(linitial(l)));
}
}
else if (IsA(arg, Float) || IsA(arg, Integer)) // NumericOnly
{
deparseValue(str, (union ValUnion *) arg, DEPARSE_NODE_CONTEXT_NONE);
}
else if (IsA(arg, String))
{
char *s = strVal(arg);
if (!is_operator_def_arg && IsA(arg, String) && strcmp(s, "none") == 0) // NONE
{
appendStringInfoString(str, "NONE");
}
else if (isReservedKeyword(s)) // reserved_keyword
{
appendStringInfoString(str, s);
}
else // Sconst
{
deparseStringLiteral(str, s);
}
}
else
{
Assert(false);
}
}
// "definition" in gram.y
static void deparseDefinition(StringInfo str, List *options)
{
ListCell *lc = NULL;
appendStringInfoChar(str, '(');
foreach (lc, options)
{
DefElem *def_elem = castNode(DefElem, lfirst(lc));
appendStringInfoString(str, quote_identifier(def_elem->defname));
if (def_elem->arg != NULL) {
appendStringInfoString(str, " = ");
deparseDefArg(str, def_elem->arg, false);
}
if (lnext(options, lc))
appendStringInfoString(str, ", ");
}
appendStringInfoChar(str, ')');
}
// "opt_definition" in gram.y
//
// Note this method adds a trailing space if a value is output
static void deparseOptDefinition(StringInfo str, List *options)
{
if (list_length(options) > 0)
{
appendStringInfoString(str, "WITH ");
deparseDefinition(str, options);
}
}
// "create_generic_options" in gram.y
static void deparseCreateGenericOptions(StringInfo str, List *options)
{
ListCell *lc = NULL;
if (options == NULL)
return;
appendStringInfoString(str, "OPTIONS (");
foreach(lc, options)
{
DefElem *def_elem = castNode(DefElem, lfirst(lc));
appendStringInfoString(str, quote_identifier(def_elem->defname));
appendStringInfoChar(str, ' ');
deparseStringLiteral(str, strVal(def_elem->arg));
if (lnext(options, lc))
appendStringInfoString(str, ", ");
}
appendStringInfoString(str, ")");
}
// "common_func_opt_item" in gram.y
static void deparseCommonFuncOptItem(StringInfo str, DefElem *def_elem)
{
if (strcmp(def_elem->defname, "strict") == 0 && boolVal(def_elem->arg))
{
appendStringInfoString(str, "RETURNS NULL ON NULL INPUT");
}
else if (strcmp(def_elem->defname, "strict") == 0 && !boolVal(def_elem->arg))
{
appendStringInfoString(str, "CALLED ON NULL INPUT");
}
else if (strcmp(def_elem->defname, "volatility") == 0 && strcmp(strVal(def_elem->arg), "immutable") == 0)
{
appendStringInfoString(str, "IMMUTABLE");
}
else if (strcmp(def_elem->defname, "volatility") == 0 && strcmp(strVal(def_elem->arg), "stable") == 0)
{
appendStringInfoString(str, "STABLE");
}
else if (strcmp(def_elem->defname, "volatility") == 0 && strcmp(strVal(def_elem->arg), "volatile") == 0)
{
appendStringInfoString(str, "VOLATILE");
}
else if (strcmp(def_elem->defname, "security") == 0 && boolVal(def_elem->arg))
{
appendStringInfoString(str, "SECURITY DEFINER");
}
else if (strcmp(def_elem->defname, "security") == 0 && !boolVal(def_elem->arg))
{
appendStringInfoString(str, "SECURITY INVOKER");
}
else if (strcmp(def_elem->defname, "leakproof") == 0 && boolVal(def_elem->arg))
{
appendStringInfoString(str, "LEAKPROOF");
}
else if (strcmp(def_elem->defname, "leakproof") == 0 && !boolVal(def_elem->arg))
{
appendStringInfoString(str, "NOT LEAKPROOF");
}
else if (strcmp(def_elem->defname, "cost") == 0)
{
appendStringInfoString(str, "COST ");
deparseValue(str, (union ValUnion *) def_elem->arg, DEPARSE_NODE_CONTEXT_NONE);
}
else if (strcmp(def_elem->defname, "rows") == 0)
{
appendStringInfoString(str, "ROWS ");
deparseValue(str, (union ValUnion *) def_elem->arg, DEPARSE_NODE_CONTEXT_NONE);
}
else if (strcmp(def_elem->defname, "support") == 0)
{
appendStringInfoString(str, "SUPPORT ");
deparseAnyName(str, castNode(List, def_elem->arg));
}
else if (strcmp(def_elem->defname, "set") == 0 && IsA(def_elem->arg, VariableSetStmt)) // FunctionSetResetClause
{
deparseVariableSetStmt(str, castNode(VariableSetStmt, def_elem->arg));
}
else if (strcmp(def_elem->defname, "parallel") == 0)
{
appendStringInfoString(str, "PARALLEL ");
appendStringInfoString(str, quote_identifier(strVal(def_elem->arg)));
}
else
{
Assert(false);
}
}
// "NonReservedWord_or_Sconst" in gram.y
//
// Note since both identifiers and string constants are allowed here, we
// currently always return an identifier, except:
//
// 1) when the string is empty (since an empty identifier can't be scanned)
// 2) when the value is equal or larger than NAMEDATALEN (64+ characters)
static void deparseNonReservedWordOrSconst(StringInfo str, const char *val)
{
if (strlen(val) == 0)
appendStringInfoString(str, "''");
else if (strlen(val) >= NAMEDATALEN)
deparseStringLiteral(str, val);
else
appendStringInfoString(str, quote_identifier(val));
}
// "func_as" in gram.y
static void deparseFuncAs(StringInfo str, List *l)
{
ListCell *lc = NULL;
foreach(lc, l)
{
char *strval = strVal(lfirst(lc));
if (strstr(strval, "$$") == NULL)
{
appendStringInfoString(str, "$$");
appendStringInfoString(str, strval);
appendStringInfoString(str, "$$");
}
else
{
deparseStringLiteral(str, strval);
}
if (lnext(l, lc))
appendStringInfoString(str, ", ");
}
}
// "createfunc_opt_item" in gram.y
static void deparseCreateFuncOptItem(StringInfo str, DefElem *def_elem)
{
ListCell *lc = NULL;
if (strcmp(def_elem->defname, "as") == 0)
{
appendStringInfoString(str, "AS ");
deparseFuncAs(str, castNode(List, def_elem->arg));
}
else if (strcmp(def_elem->defname, "language") == 0)
{
appendStringInfoString(str, "LANGUAGE ");
deparseNonReservedWordOrSconst(str, strVal(def_elem->arg));
}
else if (strcmp(def_elem->defname, "transform") == 0)
{
List *l = castNode(List, def_elem->arg);
appendStringInfoString(str, "TRANSFORM ");
foreach (lc, l)
{
appendStringInfoString(str, "FOR TYPE ");
deparseTypeName(str, castNode(TypeName, lfirst(lc)));
if (lnext(l, lc))
appendStringInfoString(str, ", ");
}
}
else if (strcmp(def_elem->defname, "window") == 0)
{
appendStringInfoString(str, "WINDOW");
}
else
{
deparseCommonFuncOptItem(str, def_elem);
}
}
// "alter_generic_options" in gram.y
static void deparseAlterGenericOptions(StringInfo str, List *options)
{
ListCell *lc = NULL;
appendStringInfoString(str, "OPTIONS (");
foreach(lc, options)
{
DefElem *def_elem = castNode(DefElem, lfirst(lc));
switch (def_elem->defaction)
{
case DEFELEM_UNSPEC:
appendStringInfoString(str, quote_identifier(def_elem->defname));
appendStringInfoChar(str, ' ');
deparseStringLiteral(str, strVal(def_elem->arg));
break;
case DEFELEM_SET:
appendStringInfoString(str, "SET ");
appendStringInfoString(str, quote_identifier(def_elem->defname));
appendStringInfoChar(str, ' ');
deparseStringLiteral(str, strVal(def_elem->arg));
break;
case DEFELEM_ADD:
appendStringInfoString(str, "ADD ");
appendStringInfoString(str, quote_identifier(def_elem->defname));
appendStringInfoChar(str, ' ');
deparseStringLiteral(str, strVal(def_elem->arg));
break;
case DEFELEM_DROP:
appendStringInfoString(str, "DROP ");
appendStringInfoString(str, quote_identifier(def_elem->defname));
break;
}
if (lnext(options, lc))
appendStringInfoString(str, ", ");
}
appendStringInfoString(str, ") ");
}
// "func_name" in gram.y
static void deparseFuncName(StringInfo str, List *func_name)
{
ListCell *lc = NULL;
foreach(lc, func_name)
{
appendStringInfoString(str, quote_identifier(strVal(lfirst(lc))));
if (lnext(func_name, lc))
appendStringInfoChar(str, '.');
}
}
// "function_with_argtypes" in gram.y
static void deparseFunctionWithArgtypes(StringInfo str, ObjectWithArgs *object_with_args)
{
ListCell *lc;
deparseFuncName(str, object_with_args->objname);
if (!object_with_args->args_unspecified)
{
appendStringInfoChar(str, '(');