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deparse.c
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/*-------------------------------------------------------------------------
*
* deparse.c
* Query deparser for mysql_fdw
*
* Portions Copyright (c) 2012-2014, PostgreSQL Global Development Group
* Portions Copyright (c) 2004-2021, EnterpriseDB Corporation.
*
* IDENTIFICATION
* deparse.c
*
*-------------------------------------------------------------------------
*/
#include "postgres.h"
#include "access/heapam.h"
#include "access/htup_details.h"
#include "access/sysattr.h"
#include "access/transam.h"
#include "catalog/pg_collation.h"
#include "catalog/pg_namespace.h"
#include "catalog/pg_operator.h"
#include "catalog/pg_proc.h"
#include "catalog/pg_type.h"
#include "commands/defrem.h"
#include "datatype/timestamp.h"
#include "mysql_fdw.h"
#include "nodes/nodeFuncs.h"
#include "nodes/plannodes.h"
#include "optimizer/clauses.h"
#if PG_VERSION_NUM < 120000
#include "optimizer/var.h"
#else
#include "optimizer/optimizer.h"
#endif
#include "optimizer/prep.h"
#include "optimizer/tlist.h"
#include "parser/parsetree.h"
#include "pgtime.h"
#include "utils/builtins.h"
#include "utils/lsyscache.h"
#include "utils/syscache.h"
#include "utils/timestamp.h"
static char *mysql_quote_identifier(const char *str, char quotechar);
/*
* Global context for foreign_expr_walker's search of an expression tree.
*/
typedef struct foreign_glob_cxt
{
PlannerInfo *root; /* global planner state */
RelOptInfo *foreignrel; /* the foreign relation we are planning for */
/*
* For join pushdown, only a limited set of operators are allowed to be
* pushed. This flag helps us identify if we are walking through the list
* of join conditions.
*/
bool is_join_cond; /* true for join relations */
} foreign_glob_cxt;
/*
* Local (per-tree-level) context for foreign_expr_walker's search.
* This is concerned with identifying collations used in the expression.
*/
typedef enum
{
FDW_COLLATE_NONE, /* expression is of a noncollatable type */
FDW_COLLATE_SAFE, /* collation derives from a foreign Var */
FDW_COLLATE_UNSAFE /* collation derives from something else */
} FDWCollateState;
typedef struct foreign_loc_cxt
{
Oid collation; /* OID of current collation, if any */
FDWCollateState state; /* state of current collation choice */
} foreign_loc_cxt;
/*
* Context for deparseExpr
*/
typedef struct deparse_expr_cxt
{
PlannerInfo *root; /* global planner state */
RelOptInfo *foreignrel; /* the foreign relation we are planning for */
StringInfo buf; /* output buffer to append to */
List **params_list; /* exprs that will become remote Params */
} deparse_expr_cxt;
#define REL_ALIAS_PREFIX "r"
/* Handy macro to add relation name qualification */
#define ADD_REL_QUALIFIER(buf, varno) \
appendStringInfo((buf), "%s%d.", REL_ALIAS_PREFIX, (varno))
/*
* Functions to construct string representation of a node tree.
*/
static void deparseExpr(Expr *expr, deparse_expr_cxt *context);
static void mysql_deparse_var(Var *node, deparse_expr_cxt *context);
static void mysql_deparse_const(Const *node, deparse_expr_cxt *context);
static void mysql_deparse_param(Param *node, deparse_expr_cxt *context);
#if PG_VERSION_NUM < 120000
static void mysql_deparse_array_ref(ArrayRef *node, deparse_expr_cxt *context);
#else
static void mysql_deparse_array_ref(SubscriptingRef *node,
deparse_expr_cxt *context);
#endif
static void mysql_deparse_func_expr(FuncExpr *node, deparse_expr_cxt *context);
static void mysql_deparse_op_expr(OpExpr *node, deparse_expr_cxt *context);
static void mysql_deparse_operator_name(StringInfo buf,
Form_pg_operator opform);
static void mysql_deparse_distinct_expr(DistinctExpr *node,
deparse_expr_cxt *context);
static void mysql_deparse_scalar_array_op_expr(ScalarArrayOpExpr *node,
deparse_expr_cxt *context);
static void mysql_deparse_relabel_type(RelabelType *node,
deparse_expr_cxt *context);
static void mysql_deparse_bool_expr(BoolExpr *node, deparse_expr_cxt *context);
static void mysql_deparse_null_test(NullTest *node, deparse_expr_cxt *context);
static void mysql_deparse_array_expr(ArrayExpr *node,
deparse_expr_cxt *context);
static void mysql_print_remote_param(int paramindex, Oid paramtype,
int32 paramtypmod,
deparse_expr_cxt *context);
static void mysql_print_remote_placeholder(Oid paramtype, int32 paramtypmod,
deparse_expr_cxt *context);
static void mysql_deparse_relation(StringInfo buf, Relation rel);
static void mysql_deparse_target_list(StringInfo buf, PlannerInfo *root,
Index rtindex, Relation rel,
Bitmapset *attrs_used,
List **retrieved_attrs);
static void mysql_deparse_column_ref(StringInfo buf, int varno, int varattno,
PlannerInfo *root, bool qualify_col);
static void mysql_deparse_select_sql(List *tlist, List **retrieved_attrs,
deparse_expr_cxt *context);
static void mysql_append_conditions(List *exprs, deparse_expr_cxt *context);
static void mysql_deparse_explicit_target_list(List *tlist,
List **retrieved_attrs,
deparse_expr_cxt *context);
static void mysql_deparse_from_expr(StringInfo buf, PlannerInfo *root,
RelOptInfo *foreignrel, bool use_alias,
List **param_list);
/*
* Functions to construct string representation of a specific types.
*/
static void deparse_interval(StringInfo buf, Datum datum);
/*
* Local variables.
*/
static char *cur_opname = NULL;
/*
* Append remote name of specified foreign table to buf. Use value of
* table_name FDW option (if any) instead of relation's name. Similarly,
* schema_name FDW option overrides schema name.
*/
static void
mysql_deparse_relation(StringInfo buf, Relation rel)
{
ForeignTable *table;
const char *nspname = NULL;
const char *relname = NULL;
ListCell *lc;
/* Obtain additional catalog information. */
table = GetForeignTable(RelationGetRelid(rel));
/*
* Use value of FDW options if any, instead of the name of object itself.
*/
foreach(lc, table->options)
{
DefElem *def = (DefElem *) lfirst(lc);
if (strcmp(def->defname, "dbname") == 0)
nspname = defGetString(def);
else if (strcmp(def->defname, "table_name") == 0)
relname = defGetString(def);
}
/*
* Note: we could skip printing the schema name if it's pg_catalog, but
* that doesn't seem worth the trouble.
*/
if (nspname == NULL)
nspname = get_namespace_name(RelationGetNamespace(rel));
if (relname == NULL)
relname = RelationGetRelationName(rel);
appendStringInfo(buf, "%s.%s", mysql_quote_identifier(nspname, '`'),
mysql_quote_identifier(relname, '`'));
}
static char *
mysql_quote_identifier(const char *str, char quotechar)
{
char *result = palloc(strlen(str) * 2 + 3);
char *res = result;
*res++ = quotechar;
while (*str)
{
if (*str == quotechar)
*res++ = *str;
*res++ = *str;
str++;
}
*res++ = quotechar;
*res++ = '\0';
return result;
}
/*
* mysql_deparse_select_stmt_for_rel
* Deparse SELECT statement for given relation into buf.
*
* tlist contains the list of desired columns to be fetched from foreign
* server. For a base relation fpinfo->attrs_used is used to construct
* SELECT clause, hence the tlist is ignored for a base relation.
*
* remote_conds is the list of conditions to be deparsed into the WHERE clause.
*
* If params_list is not NULL, it receives a list of Params and other-relation
* Vars used in the clauses; these values must be transmitted to the remote
* server as parameter values.
*
* If params_list is NULL, we're generating the query for EXPLAIN purposes,
* so Params and other-relation Vars should be replaced by dummy values.
*
* List of columns selected is returned in retrieved_attrs.
*/
extern void
mysql_deparse_select_stmt_for_rel(StringInfo buf, PlannerInfo *root,
RelOptInfo *rel, List *tlist,
List *remote_conds, List **retrieved_attrs,
List **params_list)
{
deparse_expr_cxt context;
/* We handle relations for foreign tables and joins between those */
#if PG_VERSION_NUM >= 100000
Assert(IS_JOIN_REL(rel) || IS_SIMPLE_REL(rel));
#else
Assert(rel->reloptkind == RELOPT_JOINREL ||
rel->reloptkind == RELOPT_BASEREL ||
rel->reloptkind == RELOPT_OTHER_MEMBER_REL);
#endif
/* Fill portions of context common to base relation */
context.buf = buf;
context.root = root;
context.foreignrel = rel;
context.params_list = params_list;
/* Construct SELECT clause and FROM clause */
mysql_deparse_select_sql(tlist, retrieved_attrs, &context);
/* Construct WHERE clause */
if (remote_conds != NIL)
{
appendStringInfoString(buf, " WHERE ");
mysql_append_conditions(remote_conds, &context);
}
}
/*
* mysql_deparse_select_sql
* Construct a simple SELECT statement that retrieves desired columns
* of the specified foreign table, and append it to "buf". The output
* contains just "SELECT ... FROM ....".
*
* tlist is the list of desired columns. Read prologue of
* mysql_deparse_select_stmt_for_rel() for details.
*
* We also create an integer List of the columns being retrieved, which is
* returned to *retrieved_attrs.
*/
static void
mysql_deparse_select_sql(List *tlist, List **retrieved_attrs,
deparse_expr_cxt *context)
{
StringInfo buf = context->buf;
RelOptInfo *foreignrel = context->foreignrel;
PlannerInfo *root = context->root;
/*
* Construct SELECT list
*/
appendStringInfoString(buf, "SELECT ");
#if PG_VERSION_NUM >= 100000
if (IS_JOIN_REL(foreignrel))
#else
if (foreignrel->reloptkind == RELOPT_JOINREL)
#endif
{
/* For a join relation use the input tlist */
mysql_deparse_explicit_target_list(tlist, retrieved_attrs, context);
/*
* Construct FROM clause
*/
appendStringInfoString(buf, " FROM ");
mysql_deparse_from_expr(buf, root, foreignrel, true, context->params_list);
}
else
{
RangeTblEntry *rte = planner_rt_fetch(foreignrel->relid, root);
Relation rel;
MySQLFdwRelationInfo *fpinfo = (MySQLFdwRelationInfo *) foreignrel->fdw_private;
/*
* Core code already has some lock on each rel being planned, so we can
* use NoLock here.
*/
#if PG_VERSION_NUM < 130000
rel = heap_open(rte->relid, NoLock);
#else
rel = table_open(rte->relid, NoLock);
#endif
mysql_deparse_target_list(buf, root, foreignrel->relid, rel,
fpinfo->attrs_used, retrieved_attrs);
/*
* Construct FROM clause
*/
appendStringInfoString(buf, " FROM ");
mysql_deparse_relation(buf, rel);
#if PG_VERSION_NUM < 130000
heap_close(rel, NoLock);
#else
table_close(rel, NoLock);
#endif
}
}
/*
* mysql_deparse_explicit_target_list
* Deparse given targetlist and append it to context->buf.
*
* retrieved_attrs is the list of continuously increasing integers starting
* from 1. It has same number of entries as tlist.
*/
static void
mysql_deparse_explicit_target_list(List *tlist, List **retrieved_attrs,
deparse_expr_cxt *context)
{
ListCell *lc;
StringInfo buf = context->buf;
int i = 0;
*retrieved_attrs = NIL;
foreach(lc, tlist)
{
Var *var;
var = (Var *) lfirst(lc);
/* We expect only Var nodes here */
Assert(IsA(var, Var));
if (i > 0)
appendStringInfoString(buf, ", ");
mysql_deparse_var(var, context);
*retrieved_attrs = lappend_int(*retrieved_attrs, i + 1);
i++;
}
if (i == 0)
appendStringInfoString(buf, "NULL");
}
/*
* Deparse remote INSERT statement
*
* The statement text is appended to buf, and we also create an integer List
* of the columns being retrieved by RETURNING (if any), which is returned
* to *retrieved_attrs.
*/
void
mysql_deparse_insert(StringInfo buf, PlannerInfo *root, Index rtindex,
Relation rel, List *targetAttrs)
{
ListCell *lc;
appendStringInfoString(buf, "INSERT INTO ");
mysql_deparse_relation(buf, rel);
if (targetAttrs)
{
AttrNumber pindex;
bool first;
appendStringInfoChar(buf, '(');
first = true;
foreach(lc, targetAttrs)
{
int attnum = lfirst_int(lc);
if (!first)
appendStringInfoString(buf, ", ");
first = false;
mysql_deparse_column_ref(buf, rtindex, attnum, root, false);
}
appendStringInfoString(buf, ") VALUES (");
pindex = 1;
first = true;
foreach(lc, targetAttrs)
{
if (!first)
appendStringInfoString(buf, ", ");
first = false;
appendStringInfo(buf, "?");
pindex++;
}
appendStringInfoChar(buf, ')');
}
else
appendStringInfoString(buf, " DEFAULT VALUES");
}
void
mysql_deparse_analyze(StringInfo sql, char *dbname, char *relname)
{
appendStringInfo(sql, "SELECT");
appendStringInfo(sql, " round(((data_length + index_length)), 2)");
appendStringInfo(sql, " FROM information_schema.TABLES");
appendStringInfo(sql, " WHERE table_schema = '%s' AND table_name = '%s'",
dbname, relname);
}
/*
* Emit a target list that retrieves the columns specified in attrs_used.
* This is used for both SELECT and RETURNING targetlists.
*/
static void
mysql_deparse_target_list(StringInfo buf, PlannerInfo *root, Index rtindex,
Relation rel, Bitmapset *attrs_used,
List **retrieved_attrs)
{
TupleDesc tupdesc = RelationGetDescr(rel);
bool have_wholerow;
bool first;
int i;
/* If there's a whole-row reference, we'll need all the columns. */
have_wholerow = bms_is_member(0 - FirstLowInvalidHeapAttributeNumber,
attrs_used);
first = true;
*retrieved_attrs = NIL;
for (i = 1; i <= tupdesc->natts; i++)
{
Form_pg_attribute attr = TupleDescAttr(tupdesc, i - 1);
/* Ignore dropped attributes. */
if (attr->attisdropped)
continue;
if (have_wholerow ||
bms_is_member(i - FirstLowInvalidHeapAttributeNumber, attrs_used))
{
if (!first)
appendStringInfoString(buf, ", ");
first = false;
mysql_deparse_column_ref(buf, rtindex, i, root, false);
*retrieved_attrs = lappend_int(*retrieved_attrs, i);
}
}
/* Don't generate bad syntax if no undropped columns */
if (first)
appendStringInfoString(buf, "NULL");
}
/*
* Construct name to use for given column, and emit it into buf. If it has a
* column_name FDW option, use that instead of attribute name.
*/
static void
mysql_deparse_column_ref(StringInfo buf, int varno, int varattno,
PlannerInfo *root, bool qualify_col)
{
RangeTblEntry *rte;
char *colname = NULL;
List *options;
ListCell *lc;
/* varno must not be any of OUTER_VAR, INNER_VAR and INDEX_VAR. */
Assert(!IS_SPECIAL_VARNO(varno));
/* Get RangeTblEntry from array in PlannerInfo. */
rte = planner_rt_fetch(varno, root);
/*
* If it's a column of a foreign table, and it has the column_name FDW
* option, use that value.
*/
options = GetForeignColumnOptions(rte->relid, varattno);
foreach(lc, options)
{
DefElem *def = (DefElem *) lfirst(lc);
if (strcmp(def->defname, "column_name") == 0)
{
colname = defGetString(def);
break;
}
}
/*
* If it's a column of a regular table or it doesn't have column_name
* FDW option, use attribute name.
*/
if (colname == NULL)
#if PG_VERSION_NUM >= 110000
colname = get_attname(rte->relid, varattno, false);
#else
colname = get_relid_attribute_name(rte->relid, varattno);
#endif
if (qualify_col)
ADD_REL_QUALIFIER(buf, varno);
appendStringInfoString(buf, mysql_quote_identifier(colname, '`'));
}
static void
mysql_deparse_string(StringInfo buf, const char *val, bool isstr)
{
const char *valptr;
int i = 0;
if (isstr)
appendStringInfoChar(buf, '\'');
for (valptr = val; *valptr; valptr++,i++)
{
char ch = *valptr;
/*
* Remove '{', '}', and \" character from the string. Because this
* syntax is not recognize by the remote MySQL server.
*/
if ((ch == '{' && i == 0) || (ch == '}' && (i == (strlen(val) - 1))) ||
ch == '\"')
continue;
if (isstr && ch == ',')
{
appendStringInfoString(buf, "', '");
continue;
}
appendStringInfoChar(buf, ch);
}
if (isstr)
appendStringInfoChar(buf, '\'');
}
/*
* Append a SQL string literal representing "val" to buf.
*/
static void
mysql_deparse_string_literal(StringInfo buf, const char *val)
{
const char *valptr;
appendStringInfoChar(buf, '\'');
for (valptr = val; *valptr; valptr++)
{
char ch = *valptr;
if (SQL_STR_DOUBLE(ch, true))
appendStringInfoChar(buf, ch);
appendStringInfoChar(buf, ch);
}
appendStringInfoChar(buf, '\'');
}
/*
* Deparse given expression into context->buf.
*
* This function must support all the same node types that foreign_expr_walker
* accepts.
*
* Note: unlike ruleutils.c, we just use a simple hard-wired parenthesization
* scheme: anything more complex than a Var, Const, function call or cast
* should be self-parenthesized.
*/
static void
deparseExpr(Expr *node, deparse_expr_cxt *context)
{
if (node == NULL)
return;
switch (nodeTag(node))
{
case T_Var:
mysql_deparse_var((Var *) node, context);
break;
case T_Const:
mysql_deparse_const((Const *) node, context);
break;
case T_Param:
mysql_deparse_param((Param *) node, context);
break;
#if PG_VERSION_NUM < 120000
case T_ArrayRef:
mysql_deparse_array_ref((ArrayRef *) node, context);
#else
case T_SubscriptingRef:
mysql_deparse_array_ref((SubscriptingRef *) node, context);
#endif
break;
case T_FuncExpr:
mysql_deparse_func_expr((FuncExpr *) node, context);
break;
case T_OpExpr:
mysql_deparse_op_expr((OpExpr *) node, context);
break;
case T_DistinctExpr:
mysql_deparse_distinct_expr((DistinctExpr *) node, context);
break;
case T_ScalarArrayOpExpr:
mysql_deparse_scalar_array_op_expr((ScalarArrayOpExpr *) node,
context);
break;
case T_RelabelType:
mysql_deparse_relabel_type((RelabelType *) node, context);
break;
case T_BoolExpr:
mysql_deparse_bool_expr((BoolExpr *) node, context);
break;
case T_NullTest:
mysql_deparse_null_test((NullTest *) node, context);
break;
case T_ArrayExpr:
mysql_deparse_array_expr((ArrayExpr *) node, context);
break;
default:
elog(ERROR, "unsupported expression type for deparse: %d",
(int) nodeTag(node));
break;
}
}
/*
* Deparse Interval type into MySQL Interval representation.
*/
static void
deparse_interval(StringInfo buf, Datum datum)
{
struct pg_tm tm;
fsec_t fsec;
bool is_first = true;
#define append_interval(expr, unit) \
do { \
if (!is_first) \
appendStringInfo(buf, " %s ", cur_opname); \
appendStringInfo(buf, "INTERVAL %d %s", expr, unit); \
is_first = false; \
} while (0)
/* Check saved opname. It could be only "+" and "-" */
Assert(cur_opname);
if (interval2tm(*DatumGetIntervalP(datum), &tm, &fsec) != 0)
elog(ERROR, "could not convert interval to tm");
if (tm.tm_year > 0)
append_interval(tm.tm_year, "YEAR");
if (tm.tm_mon > 0)
append_interval(tm.tm_mon, "MONTH");
if (tm.tm_mday > 0)
append_interval(tm.tm_mday, "DAY");
if (tm.tm_hour > 0)
append_interval(tm.tm_hour, "HOUR");
if (tm.tm_min > 0)
append_interval(tm.tm_min, "MINUTE");
if (tm.tm_sec > 0)
append_interval(tm.tm_sec, "SECOND");
if (fsec > 0)
{
if (!is_first)
appendStringInfo(buf, " %s ", cur_opname);
#ifdef HAVE_INT64_TIMESTAMP
appendStringInfo(buf, "INTERVAL %d MICROSECOND", fsec);
#else
appendStringInfo(buf, "INTERVAL %f MICROSECOND", fsec);
#endif
}
}
/*
* Deparse remote UPDATE statement
*
* The statement text is appended to buf, and we also create an integer List
* of the columns being retrieved by RETURNING (if any), which is returned
* to *retrieved_attrs.
*/
void
mysql_deparse_update(StringInfo buf, PlannerInfo *root, Index rtindex,
Relation rel, List *targetAttrs, char *attname)
{
AttrNumber pindex;
bool first;
ListCell *lc;
appendStringInfoString(buf, "UPDATE ");
mysql_deparse_relation(buf, rel);
appendStringInfoString(buf, " SET ");
pindex = 2;
first = true;
foreach(lc, targetAttrs)
{
int attnum = lfirst_int(lc);
if (attnum == 1)
continue;
if (!first)
appendStringInfoString(buf, ", ");
first = false;
mysql_deparse_column_ref(buf, rtindex, attnum, root, false);
appendStringInfo(buf, " = ?");
pindex++;
}
appendStringInfo(buf, " WHERE %s = ?", attname);
}
/*
* Deparse remote DELETE statement
*
* The statement text is appended to buf, and we also create an integer List
* of the columns being retrieved by RETURNING (if any), which is returned
* to *retrieved_attrs.
*/
void
mysql_deparse_delete(StringInfo buf, PlannerInfo *root, Index rtindex,
Relation rel, char *name)
{
appendStringInfoString(buf, "DELETE FROM ");
mysql_deparse_relation(buf, rel);
appendStringInfo(buf, " WHERE %s = ?", name);
}
/*
* Deparse given Var node into context->buf.
*
* If the Var belongs to the foreign relation, just print its remote name.
* Otherwise, it's effectively a Param (and will in fact be a Param at
* run time). Handle it the same way we handle plain Params --- see
* deparseParam for comments.
*/
static void
mysql_deparse_var(Var *node, deparse_expr_cxt *context)
{
Relids relids = context->foreignrel->relids;
bool qualify_col = (bms_membership(relids) == BMS_MULTIPLE);
if (bms_is_member(node->varno, relids) && node->varlevelsup == 0)
{
/* Var belongs to foreign table */
mysql_deparse_column_ref(context->buf, node->varno, node->varattno,
context->root, qualify_col);
}
else
{
/* Treat like a Param */
if (context->params_list)
{
int pindex = 0;
ListCell *lc;
/* Find its index in params_list */
foreach(lc, *context->params_list)
{
pindex++;
if (equal(node, (Node *) lfirst(lc)))
break;
}
if (lc == NULL)
{
/* Not in list, so add it */
pindex++;
*context->params_list = lappend(*context->params_list, node);
}
mysql_print_remote_param(pindex, node->vartype, node->vartypmod,
context);
}
else
mysql_print_remote_placeholder(node->vartype, node->vartypmod,
context);
}
}
/*
* Deparse given constant value into context->buf.
*
* This function has to be kept in sync with ruleutils.c's get_const_expr.
*/
static void
mysql_deparse_const(Const *node, deparse_expr_cxt *context)
{
StringInfo buf = context->buf;
Oid typoutput;
bool typIsVarlena;
char *extval;
if (node->constisnull)
{
appendStringInfoString(buf, "NULL");
return;
}
getTypeOutputInfo(node->consttype, &typoutput, &typIsVarlena);
switch (node->consttype)
{
case INT2OID:
case INT4OID:
case INT8OID:
case OIDOID:
case FLOAT4OID:
case FLOAT8OID:
case NUMERICOID:
{
extval = OidOutputFunctionCall(typoutput, node->constvalue);
/*
* No need to quote unless it's a special value such as 'NaN'.
* See comments in get_const_expr().
*/
if (strspn(extval, "0123456789+-eE.") == strlen(extval))
{
if (extval[0] == '+' || extval[0] == '-')
appendStringInfo(buf, "(%s)", extval);
else
appendStringInfoString(buf, extval);
}
else
appendStringInfo(buf, "'%s'", extval);
}
break;
case BITOID:
case VARBITOID:
extval = OidOutputFunctionCall(typoutput, node->constvalue);
appendStringInfo(buf, "B'%s'", extval);
break;
case BOOLOID:
extval = OidOutputFunctionCall(typoutput, node->constvalue);
if (strcmp(extval, "t") == 0)
appendStringInfoString(buf, "true");
else
appendStringInfoString(buf, "false");
break;
case INTERVALOID:
deparse_interval(buf, node->constvalue);
break;
case BYTEAOID:
/*
* The string for BYTEA always seems to be in the format "\\x##"
* where # is a hex digit, Even if the value passed in is
* 'hi'::bytea we will receive "\x6869". Making this assumption
* allows us to quickly convert postgres escaped strings to mysql
* ones for comparison
*/
extval = OidOutputFunctionCall(typoutput, node->constvalue);
appendStringInfo(buf, "X\'%s\'", extval + 2);
break;
default:
extval = OidOutputFunctionCall(typoutput, node->constvalue);
mysql_deparse_string_literal(buf, extval);
break;
}
}
/*
* Deparse given Param node.
*
* If we're generating the query "for real", add the Param to
* context->params_list if it's not already present, and then use its index
* in that list as the remote parameter number. During EXPLAIN, there's
* no need to identify a parameter number.
*/
static void
mysql_deparse_param(Param *node, deparse_expr_cxt *context)
{
if (context->params_list)
{
int pindex = 0;
ListCell *lc;
/* Find its index in params_list */
foreach(lc, *context->params_list)
{
pindex++;
if (equal(node, (Node *) lfirst(lc)))
break;
}
if (lc == NULL)
{
/* Not in list, so add it */
pindex++;
*context->params_list = lappend(*context->params_list, node);
}
mysql_print_remote_param(pindex, node->paramtype, node->paramtypmod,
context);
}
else
mysql_print_remote_placeholder(node->paramtype, node->paramtypmod,
context);
}
/*
* Deparse an array subscript expression.
*/
static void
#if PG_VERSION_NUM < 120000
mysql_deparse_array_ref(ArrayRef *node, deparse_expr_cxt *context)
#else
mysql_deparse_array_ref(SubscriptingRef *node, deparse_expr_cxt *context)
#endif
{
StringInfo buf = context->buf;
ListCell *lowlist_item;
ListCell *uplist_item;
/* Always parenthesize the expression. */
appendStringInfoChar(buf, '(');
/*
* Deparse referenced array expression first. If that expression includes
* a cast, we have to parenthesize to prevent the array subscript from
* being taken as typename decoration. We can avoid that in the typical
* case of subscripting a Var, but otherwise do it.
*/
if (IsA(node->refexpr, Var))
deparseExpr(node->refexpr, context);
else
{
appendStringInfoChar(buf, '(');
deparseExpr(node->refexpr, context);
appendStringInfoChar(buf, ')');
}
/* Deparse subscript expressions. */
lowlist_item = list_head(node->reflowerindexpr); /* could be NULL */
foreach(uplist_item, node->refupperindexpr)
{
appendStringInfoChar(buf, '[');
if (lowlist_item)
{
deparseExpr(lfirst(lowlist_item), context);
appendStringInfoChar(buf, ':');
#if PG_VERSION_NUM < 130000
lowlist_item = lnext(lowlist_item);
#else
lowlist_item = lnext(node->reflowerindexpr, lowlist_item);
#endif
}
deparseExpr(lfirst(uplist_item), context);
appendStringInfoChar(buf, ']');
}
appendStringInfoChar(buf, ')');
}
/*