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griddb_fdw.c
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/*
* GridDB Foreign Data Wrapper
*
* Portions Copyright (c) 2018, TOSHIBA CORPORATION
*
* IDENTIFICATION
* griddb_fdw.c
*
*/
#include "postgres.h"
#include "griddb_fdw.h"
#include "access/htup_details.h"
#include "access/sysattr.h"
#include "nodes/pg_list.h"
#include "nodes/makefuncs.h"
#include "catalog/pg_type.h"
#include "catalog/pg_proc.h"
#include "catalog/pg_opfamily.h"
#include "commands/explain.h"
#include "commands/defrem.h"
#include "executor/spi.h"
#include "foreign/fdwapi.h"
#include "foreign/foreign.h"
#include "funcapi.h"
#include "miscadmin.h"
#if (PG_VERSION_NUM >= 140000)
#include "optimizer/appendinfo.h"
#endif
#include "optimizer/cost.h"
#include "optimizer/inherit.h"
#include "optimizer/paths.h"
#include "optimizer/pathnode.h"
#include "optimizer/planmain.h"
#include "optimizer/restrictinfo.h"
#include "optimizer/tlist.h"
#include "parser/parsetree.h"
#include "storage/ipc.h"
#include "utils/builtins.h"
#include "utils/datetime.h"
#include "utils/datum.h"
#include "utils/guc.h"
#include "utils/memutils.h"
#include "utils/rel.h"
#include "utils/lsyscache.h"
#include "utils/syscache.h"
#include "utils/elog.h"
#include "utils/timestamp.h"
#if (PG_VERSION_NUM < 100000)
#include "utils/bytea.h"
#endif
PG_MODULE_MAGIC;
/*
* Indexes of FDW-private information stored in fdw_private lists.
*
* These items are indexed with the enum FdwScanPrivateIndex, so an item
* can be fetched with list_nth(). For example, to get the SELECT statement:
* sql = strVal(list_nth(fdw_private, FdwScanPrivateSelectSql));
*/
enum FdwScanPrivateIndex
{
/* SQL statement to execute remotely (as a String node) */
FdwScanPrivateSelectSql,
/* Integer list of attribute numbers retrieved by the SELECT */
FdwScanPrivateRetrievedAttrs,
/* Integer representing UPDATE/DELETE target */
FdwScanPrivateForUpdate,
/* Scan tlist */
FdwScanTlist,
/* RTE */
FDWScanRTE,
/* Integer representing aggregate function name */
FdwScanPrivateAggRefName,
/* Integer representing aggregate function */
FdwScanPrivateAggRefColumn,
};
/* Callback argument for ec_member_matches_foreign */
typedef struct ec_member_foreign_arg
{
Expr *current; /* current expr, or NULL if not yet found */
List *already_used; /* expressions already dealt with */
} ec_member_foreign_arg;
/*
* Similarly, this enum describes what's kept in the fdw_private list for
* a ModifyTable node referencing a griddb_fdw foreign table. We store:
*
* 1) INSERT/UPDATE/DELETE statement text to be sent to the remote server
* 2) Integer list of target attribute numbers for INSERT/UPDATE
* (NIL for a DELETE)
*/
enum FdwModifyPrivateIndex
{
/* Integer list of target attribute numbers for INSERT/UPDATE */
FdwModifyPrivateTargetAttnums,
};
/*
* Similarly, this enum describes what's kept in the fdw_private list for
* a ForeignScan node that modifies a foreign table directly. We store:
*
* 1) UPDATE/DELETE statement text to be sent to the remote server
* 2) Boolean flag showing if the remote query has a RETURNING clause
* 3) Integer list of attribute numbers retrieved by RETURNING, if any
* 4) Boolean flag showing if we set the command es_processed
*/
enum FdwDirectModifyPrivateIndex
{
/* SQL statement to execute remotely (as a String node) */
FdwDirectModifyPrivateUpdateSql,
/* has-returning flag (as an integer Value node) */
FdwDirectModifyPrivateHasReturning,
/* Integer list of attribute numbers retrieved by RETURNING */
FdwDirectModifyPrivateRetrievedAttrs,
/* set-processed flag (as an integer Value node) */
FdwDirectModifyPrivateSetProcessed,
};
/*
* This enum describes what's kept in the fdw_private list for a ForeignPath.
* We store:
*
* 1) Boolean flag showing if the remote query has the final sort
* 2) Boolean flag showing if the remote query has the LIMIT clause
*/
enum FdwPathPrivateIndex
{
/* has-final-sort flag (as an integer Value node) */
FdwPathPrivateHasFinalSort,
/* has-limit flag (as an integer Value node) */
FdwPathPrivateHasLimit,
};
/*
* DDL commands
*/
enum GridDBFdwDDLCommand
{
DDL_COMMAND_CREATE, /* Create data source */
DDL_COMMAND_DROP, /* Drop data source */
};
/*
* The following structures are used for sharing data between scaning
* functions and modification functions.
* In griddb_fdw, the data modification (UPDATE/DELETE) is done via rowset
* which is created by ForeignScan. So rowset must be passed from ForeignScan
* to ForeignModify.
*/
typedef Oid GridDBFdwSMRelayKey; /* foreigntableid */
typedef struct GridDBFdwSMRelay
{
GridDBFdwSMRelayKey key; /* hash key (must be first) */
GSRowSet *row_set; /* result set */
GSRow *row; /* row for the update */
GridDBFdwFieldInfo field_info; /* column information */
Datum rowkey_val; /* rowkey the cursor is pointing */
} GridDBFdwSMRelay;
static HTAB *griddb_sm_share = NULL;
static bool griddb_enable_partial_execution = false;
/*
* Execution state of a foreign scan using griddb_fdw.
*/
typedef struct GridDBFdwScanState
{
Relation rel; /* relcache entry for the foreign table. NULL
* for a foreign join scan. */
TupleDesc tupdesc; /* tuple descriptor of scan */
/* extracted fdw_private data */
char *query; /* text of SELECT command */
List *retrieved_attrs; /* list of retrieved attribute numbers */
List *fdw_scan_tlist; /* optional tlist describing scan tuple */
/* for remote query execution */
GSGridStore *store; /* connection for the scan */
GSChar *cont_name; /* container name */
GSContainer *cont; /* container to be selected */
GSBool for_update; /* GS_TRUE if UPDATE/DELETE target */
GridDBFdwFieldInfo field_info; /* field information */
GSRowSet *row_set; /* result set */
GSRow *row; /* row for the update */
GridDBAggref *aggref; /* aggregate function information */
/* for storing result tuples */
unsigned int cursor; /* result set cursor pointing current index */
/* for sharing data with ForeignModify */
GridDBFdwSMRelay *smrelay; /* cache of the relay */
} GridDBFdwScanState;
/*
* Execution state of a foreign insert/update/delete operation.
*/
typedef struct GridDBFdwModifyState
{
Relation rel; /* relcache entry for the foreign table */
/* for remote query execution */
GSGridStore *store; /* connection for the scan */
GSChar *cont_name; /* container name */
GSContainer *cont; /* container to be modified */
/* extracted fdw_private data */
List *target_attrs; /* list of target attribute numbers */
bool bulk_mode; /* true if UPDATE/DELETE targets are pointing
* different rows from result set cursor */
AttrNumber junk_att_no; /* rowkey attribute number */
HTAB *modified_rowkeys; /* rowkey hash */
GridDBFdwModifiedRows modified_rows;
CmdType operation; /* INSERT, UPDATE, or DELETE */
/* for sharing data with ForeignScan */
GridDBFdwSMRelay *smrelay; /* cache of the relay */
int batch_size; /* value of FDW option "batch_size" */
MemoryContext temp_cxt; /* context for temporary data */
struct GridDBFdwModifyState *aux_fmstate; /* foreign-insert state, if
* created */
} GridDBFdwModifyState;
/*
* SQL functions
*/
extern Datum griddb_fdw_handler(PG_FUNCTION_ARGS);
PG_FUNCTION_INFO_V1(griddb_fdw_handler);
PG_FUNCTION_INFO_V1(griddb_fdw_version);
void _PG_init(void);
void _PG_fini(void);
/*
* FDW callback routines
*/
static void griddbGetForeignRelSize(PlannerInfo *root,
RelOptInfo *baserel,
Oid foreigntableid);
static void griddbGetForeignPaths(PlannerInfo *root,
RelOptInfo *baserel,
Oid foreigntableid);
static ForeignScan *griddbGetForeignPlan(PlannerInfo *root,
RelOptInfo *baserel,
Oid foreigntableid,
ForeignPath *best_path,
List *tlist,
List *scan_clauses,
Plan *outer_plan);
static void griddbBeginForeignScan(ForeignScanState *node, int eflags);
static TupleTableSlot *griddbIterateForeignScan(ForeignScanState *node);
static void griddbReScanForeignScan(ForeignScanState *node);
static void griddbEndForeignScan(ForeignScanState *node);
#if PG_VERSION_NUM < 140000
static void griddbAddForeignUpdateTargets(Query *parsetree,
RangeTblEntry *target_rte,
Relation target_relation);
#else
static void griddbAddForeignUpdateTargets(PlannerInfo *root,
Index rtindex,
RangeTblEntry *target_rte,
Relation target_relation);
#endif
static List *griddbPlanForeignModify(PlannerInfo *root,
ModifyTable *plan,
Index resultRelation,
int subplan_index);
static void griddbBeginForeignModify(ModifyTableState *mtstate,
ResultRelInfo *resultRelInfo,
List *fdw_private,
int subplan_index,
int eflags);
static TupleTableSlot *griddbExecForeignInsert(EState *estate,
ResultRelInfo *resultRelInfo,
TupleTableSlot *slot,
TupleTableSlot *planSlot);
#if PG_VERSION_NUM >= 140000
static TupleTableSlot **griddbExecForeignBatchInsert(EState *estate,
ResultRelInfo *resultRelInfo,
TupleTableSlot **slots,
TupleTableSlot **planSlots,
int *numSlots);
static int griddbGetForeignModifyBatchSize(ResultRelInfo *resultRelInfo);
#endif
static TupleTableSlot *griddbExecForeignUpdate(EState *estate,
ResultRelInfo *resultRelInfo,
TupleTableSlot *slot,
TupleTableSlot *planSlot);
static TupleTableSlot *griddbExecForeignDelete(EState *estate,
ResultRelInfo *resultRelInfo,
TupleTableSlot *slot,
TupleTableSlot *planSlot);
static void griddbEndForeignModify(EState *estate,
ResultRelInfo *resultRelInfo);
#if (PG_VERSION_NUM >= 110000)
static void griddbEndForeignInsert(EState *estate,
ResultRelInfo *resultRelInfo);
static void griddbBeginForeignInsert(ModifyTableState *mtstate,
ResultRelInfo *resultRelInfo);
#endif
static int griddbIsForeignRelUpdatable(Relation rel);
static bool griddbPlanDirectModify(PlannerInfo *root,
ModifyTable *plan,
Index resultRelation,
int subplan_index);
static void griddbExplainForeignScan(ForeignScanState *node,
ExplainState *es);
static void griddbExplainForeignModify(ModifyTableState *mtstate,
ResultRelInfo *rinfo,
List *fdw_private,
int subplan_index,
ExplainState *es);
static bool griddbAnalyzeForeignTable(Relation relation,
AcquireSampleRowsFunc *func,
BlockNumber *totalpages);
static List *griddbImportForeignSchema(ImportForeignSchemaStmt *stmt,
Oid serverOid);
static void griddbGetForeignUpperPaths(PlannerInfo *root,
UpperRelationKind stage,
RelOptInfo *input_rel,
RelOptInfo *output_rel
#if (PG_VERSION_NUM >= 110000)
,void *extra
#endif
);
static void griddb_get_datatype_for_conversion(Oid pg_type, regproc *typeinput,
int *typemod);
static bool griddb_foreign_grouping_ok(PlannerInfo *root, RelOptInfo *grouped_rel);
static void griddb_add_foreign_grouping_paths(PlannerInfo *root,
RelOptInfo *input_rel,
RelOptInfo *grouped_rel
#if (PG_VERSION_NUM >= 110000)
,GroupPathExtraData *extra
#endif
);
/*
* Helper functions
*/
static void griddb_fdw_exit(int code, Datum arg);
static void estimate_path_cost_size(PlannerInfo *root,
RelOptInfo *baserel,
List *join_conds,
List *pathkeys,
GriddbFdwPathExtraData * fpextra,
double *p_rows, int *p_width,
Cost *p_startup_cost, Cost *p_total_cost);
static void griddb_make_column_info(GSContainerInfo * cont_info,
GridDBFdwFieldInfo * field_info);
static void griddb_free_column_info(GridDBFdwFieldInfo * field_info);
static Oid griddb_pgtyp_from_gstyp(GSType gs_type, const char **name);
static Timestamp griddb_convert_gs2pg_timestamp(GSTimestamp ts);
static char *griddb_convert_gs2pg_timestamp_to_string(GSTimestamp ts);
static GSTimestamp griddb_convert_pg2gs_timestamp(Timestamp dt);
static void griddb_execute_and_fetch(ForeignScanState *node);
static void griddb_find_junk_attno(GridDBFdwModifyState * fmstate, List *targetlist);
static void griddb_judge_bulk_mode(GridDBFdwModifyState * fmstate, TupleTableSlot *planSlot);
static void griddb_bind_for_putrow(GridDBFdwModifyState * fmstate,
TupleTableSlot *slot,
GSRow * row, Relation rel,
GridDBFdwFieldInfo * field_info);
static void griddb_add_column_name_and_type(StringInfoData *buf,
GSContainerInfo * info);
static GSChar * *grifddb_name_list_dup(const GSChar * const *src,
size_t cont_size);
static void grifddb_name_list_free(GSChar * *p, size_t cont_size);
static void griddb_execute_commands(List *cmd_list);
int griddb_set_transmission_modes();
void griddb_reset_transmission_modes(int nestlevel);
static void griddb_check_rowkey_update(GridDBFdwModifyState * fmstate, TupleTableSlot *new_slot);
static Oid griddb_get_agg_type(GridDBFdwFieldInfo field_info, GridDBAggref * aggref);
static Datum griddb_make_datum_record(StringInfoData *values, TupleDesc tupdesc, GSType * column_types,
GSRow * row, regproc typeinput, int typemod);
static List *griddb_get_useful_pathkeys_for_relation(PlannerInfo *root,
RelOptInfo *rel);
static List *griddb_get_useful_ecs_for_relation(PlannerInfo *root, RelOptInfo *rel);
static void griddb_add_paths_with_pathkeys_for_rel(PlannerInfo *root, RelOptInfo *rel,
#if PG_VERSION_NUM >= 170000
Path *epq_path, List *restrictlist);
#else
Path *epq_path);
#endif
static void griddb_add_foreign_final_paths(PlannerInfo *root, RelOptInfo *input_rel,
RelOptInfo *final_rel
#if (PG_VERSION_NUM >= 120000)
,FinalPathExtraData *extra
#endif
);
#if (PG_VERSION_NUM >= 140000)
static int get_batch_size_option(Relation rel);
#endif
static bool check_existed_container(Oid serverOid, char* tbl_name, Oid userid);
void
_PG_init()
{
on_proc_exit(&griddb_fdw_exit, PointerGetDatum(NULL));
DefineCustomBoolVariable("griddbfdw.enable_partial_execution",
"enable partial execution",
NULL,
&griddb_enable_partial_execution,
false,
PGC_USERSET,
0,
NULL,
NULL,
NULL);
}
/*
* griddb_fdw_exit: Exit callback function.
*/
static void
griddb_fdw_exit(int code, Datum arg)
{
griddb_cleanup_connection();
}
void
_PG_fini()
{
}
Datum
griddb_fdw_version(PG_FUNCTION_ARGS)
{
PG_RETURN_INT32(CODE_VERSION);
}
Datum
griddb_fdw_handler(PG_FUNCTION_ARGS)
{
FdwRoutine *routine = makeNode(FdwRoutine);
/* Functions for scanning foreign tables */
routine->GetForeignRelSize = griddbGetForeignRelSize;
routine->GetForeignPaths = griddbGetForeignPaths;
routine->GetForeignPlan = griddbGetForeignPlan;
routine->BeginForeignScan = griddbBeginForeignScan;
routine->IterateForeignScan = griddbIterateForeignScan;
routine->ReScanForeignScan = griddbReScanForeignScan;
routine->EndForeignScan = griddbEndForeignScan;
/* Functions for updating foreign tables */
routine->AddForeignUpdateTargets = griddbAddForeignUpdateTargets;
routine->PlanForeignModify = griddbPlanForeignModify;
routine->BeginForeignModify = griddbBeginForeignModify;
routine->ExecForeignInsert = griddbExecForeignInsert;
routine->ExecForeignUpdate = griddbExecForeignUpdate;
routine->ExecForeignDelete = griddbExecForeignDelete;
routine->EndForeignModify = griddbEndForeignModify;
routine->IsForeignRelUpdatable = griddbIsForeignRelUpdatable;
#if (PG_VERSION_NUM >= 110000)
routine->BeginForeignInsert = griddbBeginForeignInsert;
routine->EndForeignInsert = griddbEndForeignInsert;
#endif
routine->PlanDirectModify = griddbPlanDirectModify;
routine->BeginDirectModify = NULL;
routine->IterateDirectModify = NULL;
routine->EndDirectModify = NULL;
/* Function for EvalPlanQual rechecks */
routine->RecheckForeignScan = NULL;
/* Support functions for EXPLAIN */
routine->ExplainForeignScan = griddbExplainForeignScan;
routine->ExplainForeignModify = griddbExplainForeignModify;
routine->ExplainDirectModify = NULL;
/* Support functions for ANALYZE */
routine->AnalyzeForeignTable = griddbAnalyzeForeignTable;
#if (PG_VERSION_NUM >= 140000)
/* Support function for Batch Insert */
routine->ExecForeignBatchInsert = griddbExecForeignBatchInsert;
routine->GetForeignModifyBatchSize = griddbGetForeignModifyBatchSize;
/* Curently gridDB does not support asynchronous execution */
routine->IsForeignPathAsyncCapable = NULL;
routine->ForeignAsyncRequest = NULL;
routine->ForeignAsyncConfigureWait = NULL;
routine->ForeignAsyncNotify = NULL;
#endif
/* Support functions for IMPORT FOREIGN SCHEMA */
routine->ImportForeignSchema = griddbImportForeignSchema;
/* Not support functions for join push-down */
routine->GetForeignJoinPaths = NULL;
/* Support functions for upper relation push-down */
routine->GetForeignUpperPaths = griddbGetForeignUpperPaths;
PG_RETURN_POINTER(routine);
}
/*
* Get a hash entry of GridDBFdwScanModifyRelay corresponding to
* the foreign table oid from a global hash variable.
*/
static GridDBFdwSMRelay *
griddb_get_smrelay(Oid foreigntableid)
{
bool found;
GridDBFdwSMRelay *entry;
GridDBFdwSMRelayKey key;
/* First time through, initialize connection cache hashtable */
if (griddb_sm_share == NULL)
{
HASHCTL ctl;
MemSet(&ctl, 0, sizeof(ctl));
ctl.keysize = sizeof(GridDBFdwSMRelayKey);
ctl.entrysize = sizeof(GridDBFdwSMRelay);
/* allocate ConnectionHash in the cache context */
ctl.hcxt = CacheMemoryContext;
griddb_sm_share = hash_create("griddb_fdw scan modify relay", 8,
&ctl,
#if PG_VERSION_NUM >= 140000
HASH_ELEM | HASH_BLOBS);
#else
HASH_ELEM | HASH_BLOBS | HASH_CONTEXT);
#endif
}
/* Create hash key for the entry. Assume no pad bytes in key struct */
key = foreigntableid;
/*
* Find or create cached entry for requested connection.
*/
entry = (GridDBFdwSMRelay *) hash_search(griddb_sm_share, &key, HASH_ENTER,
&found);
if (!found)
{
/* initialize new hashtable entry (key is already filled in) */
entry->row_set = NULL;
entry->row = NULL;
memset(&entry->field_info, 0, sizeof(GridDBFdwFieldInfo));
entry->rowkey_val = 0;
}
return entry;
}
static void
griddb_close_smrelay(Oid foreigntableid)
{
GridDBFdwSMRelayKey key = foreigntableid;
Assert(griddb_sm_share);
hash_search(griddb_sm_share, &key, HASH_REMOVE, NULL);
}
/*
* griddbGetForeignRelSize
* Estimate # of rows and width of the result of the scan
*
* We should consider the effect of all baserestrictinfo clauses here, but
* not any join clauses.
*/
static void
griddbGetForeignRelSize(PlannerInfo *root,
RelOptInfo *baserel,
Oid foreigntableid)
{
GriddbFdwRelationInfo *fpinfo;
ListCell *lc;
griddb_opt *options = NULL;
elog(DEBUG1, "griddb_fdw: %s", __func__);
/*
* We use GriddbFdwRelationInfo to pass various information to subsequent
* functions.
*/
fpinfo =
(GriddbFdwRelationInfo *) palloc0(sizeof(GriddbFdwRelationInfo));
baserel->fdw_private = (void *) fpinfo;
/* Base foreign tables need to be pushed down always. */
fpinfo->pushdown_safe = true;
/* Look up foreign-table catalog info. */
fpinfo->table = GetForeignTable(foreigntableid);
fpinfo->server = GetForeignServer(fpinfo->table->serverid);
/* Fetch options */
options = griddb_get_options(foreigntableid, InvalidOid);
/*
* Extract user-settable option values. Note that per-table setting of
* use_remote_estimate overrides per-server setting.
*/
fpinfo->use_remote_estimate = options->use_remote_estimate;
fpinfo->fdw_startup_cost = options->fdw_startup_cost;
fpinfo->fdw_tuple_cost = options->fdw_tuple_cost;
fpinfo->shippable_extensions = NIL;
fpinfo->fetch_size = 100;
/*
* If the table or the server is configured to use remote estimates,
* identify which user to do remote access as during planning. This
* should match what ExecCheckPermissions() does. If we fail due to lack
* of permissions, the query would have failed at runtime anyway.
*/
if (fpinfo->use_remote_estimate)
{
#if (PG_VERSION_NUM >= 160000)
Oid userid;
userid = OidIsValid(baserel->userid) ? baserel->userid : GetUserId();
#else
RangeTblEntry *rte = planner_rt_fetch(baserel->relid, root);
Oid userid = rte->checkAsUser ? rte->checkAsUser : GetUserId();
#endif
fpinfo->user = GetUserMapping(userid, fpinfo->server->serverid);
}
else
fpinfo->user = NULL;
/*
* Identify which baserestrictinfo clauses can be sent to the remote
* server and which can't.
*/
griddb_classify_conditions(root, baserel, baserel->baserestrictinfo,
&fpinfo->remote_conds, &fpinfo->local_conds);
/*
* Identify which attributes will need to be retrieved from the remote
* server. These include all attrs needed for joins or final output, plus
* all attrs used in the local_conds. (Note: if we end up using a
* parameterized scan, it's possible that some of the join clauses will be
* sent to the remote and thus we wouldn't really need to retrieve the
* columns used in them. Doesn't seem worth detecting that case though.)
*/
fpinfo->attrs_used = NULL;
#if PG_VERSION_NUM >= 90600
pull_varattnos((Node *) baserel->reltarget->exprs, baserel->relid,
&fpinfo->attrs_used);
#else
pull_varattnos((Node *) baserel->reltargetlist, baserel->relid, &fpinfo->attrs_used);
#endif
foreach(lc, fpinfo->local_conds)
{
RestrictInfo *rinfo = (RestrictInfo *) lfirst(lc);
pull_varattnos((Node *) rinfo->clause, baserel->relid,
&fpinfo->attrs_used);
}
/*
* Compute the selectivity and cost of the local_conds, so we don't have
* to do it over again for each path. The best we can do for these
* conditions is to estimate selectivity on the basis of local statistics.
*/
fpinfo->local_conds_sel = clauselist_selectivity(root,
fpinfo->local_conds,
baserel->relid,
JOIN_INNER,
NULL);
/*
* Set cached relation costs to some negative value, so that we can detect
* when they are set to some sensible costs during one (usually the first)
* of the calls to estimate_path_cost_size().
*/
fpinfo->rel_startup_cost = -1;
fpinfo->rel_total_cost = -1;
/*
* If the table or the server is configured to use remote estimates,
* connect to the foreign server and execute EXPLAIN to estimate the
* number of rows selected by the restriction clauses, as well as the
* average row width. Otherwise, estimate using whatever statistics we
* have locally, in a way similar to ordinary tables.
*/
if (fpinfo->use_remote_estimate)
{
ereport(ERROR, (errmsg("Remote estimation is unsupported")));
}
else
{
/*
* If the foreign table has never been ANALYZEd, it will have relpages
* and reltuples equal to zero, which most likely has nothing to do
* with reality. We can't do a whole lot about that if we're not
* allowed to consult the remote server, but we can use a hack similar
* to plancat.c's treatment of empty relations: use a minimum size
* estimate of 10 pages, and divide by the column-datatype-based width
* estimate to get the corresponding number of tuples.
*/
#if PG_VERSION_NUM < 140000
if (baserel->pages == 0 && baserel->tuples == 0)
#else
if (baserel->tuples < 0)
#endif
{
baserel->pages = 10;
baserel->tuples =
(10 * BLCKSZ) / (baserel->reltarget->width +
MAXALIGN(SizeofHeapTupleHeader));
}
/* Estimate baserel size as best we can with local statistics. */
set_baserel_size_estimates(root, baserel);
/* Fill in basically-bogus cost estimates for use later. */
estimate_path_cost_size(root, baserel, NIL, NIL, NULL,
&fpinfo->rows, &fpinfo->width,
&fpinfo->startup_cost, &fpinfo->total_cost);
}
}
/*
* GetForeignPaths
* create access path for a scan on the foreign table
*/
static void
griddbGetForeignPaths(PlannerInfo *root,
RelOptInfo *baserel,
Oid foreigntableid)
{
GriddbFdwRelationInfo *fpinfo =
(GriddbFdwRelationInfo *) baserel->fdw_private;
ForeignPath *path;
elog(DEBUG1, "griddb_fdw: %s", __func__);
/*
* Create simplest ForeignScan path node and add it to baserel. This path
* corresponds to SeqScan path of regular tables (though depending on what
* baserestrict conditions we were able to send to remote, there might
* actually be an indexscan happening there). We already did all the work
* to estimate cost and size of this path.
*/
path = create_foreignscan_path(root, baserel,
#if PG_VERSION_NUM >= 90600
NULL, /* default pathtarget */
#endif
fpinfo->rows,
fpinfo->startup_cost,
fpinfo->total_cost,
NIL, /* no pathkeys */
#if (PG_VERSION_NUM >= 120000)
baserel->lateral_relids,
#else
NULL, /* no outer rel either */
#endif
NULL, /* no extra plan */
#if PG_VERSION_NUM >= 170000
NIL, /* no fdw_restrictinfo list */
#endif
NIL); /* no fdw_private list */
add_path(baserel, (Path *) path);
/* Add paths with pathkeys */
#if PG_VERSION_NUM >= 170000
griddb_add_paths_with_pathkeys_for_rel(root, baserel, NULL, NIL);
#else
griddb_add_paths_with_pathkeys_for_rel(root, baserel, NULL);
#endif
/*
* If we're not using remote estimates, stop here. We have no way to
* estimate whether any join clauses would be worth sending across, so
* don't bother building parameterized paths.
*/
if (!fpinfo->use_remote_estimate)
return;
ereport(ERROR, (errmsg("Remote estimation is unsupported")));
}
/*
* Force assorted GUC parameters to settings that ensure that we'll output
* data values in a form that is unambiguous to the remote server.
*
* This is rather expensive and annoying to do once per row, but there's
* little choice if we want to be sure values are transmitted accurately;
* we can't leave the settings in place between rows for fear of affecting
* user-visible computations.
*
* We use the equivalent of a function SET option to allow the settings to
* persist only until the caller calls griddb_reset_transmission_modes(). If an
* error is thrown in between, guc.c will take care of undoing the settings.
*
* The return value is the nestlevel that must be passed to
* griddb_reset_transmission_modes() to undo things.
*/
int
griddb_set_transmission_modes(void)
{
int nestlevel = NewGUCNestLevel();
/*
* The values set here should match what pg_dump does. See also
* configure_remote_session in connection.c.
*/
if (DateStyle != USE_ISO_DATES)
(void) set_config_option("datestyle", "ISO",
PGC_USERSET, PGC_S_SESSION,
GUC_ACTION_SAVE, true, 0, false);
if (IntervalStyle != INTSTYLE_POSTGRES)
(void) set_config_option("intervalstyle", "postgres",
PGC_USERSET, PGC_S_SESSION,
GUC_ACTION_SAVE, true, 0, false);
if (extra_float_digits < 3)
(void) set_config_option("extra_float_digits", "3",
PGC_USERSET, PGC_S_SESSION,
GUC_ACTION_SAVE, true, 0, false);
/*
* In addition force restrictive search_path, in case there are any
* regproc or similar constants to be printed.
*/
(void) set_config_option("search_path", "pg_catalog",
PGC_USERSET, PGC_S_SESSION,
GUC_ACTION_SAVE, true, 0, false);
return nestlevel;
}
/*
* Undo the effects of griddb_set_transmission_modes().
*/
void
griddb_reset_transmission_modes(int nestlevel)
{
AtEOXact_GUC(true, nestlevel);
}
/*
* GetForeignPlan
* Create ForeignScan plan node which implements selected best path
*/
static ForeignScan *
griddbGetForeignPlan(PlannerInfo *root,
RelOptInfo *foreignrel,
Oid foreigntableid,
ForeignPath *best_path,
List *tlist,
List *scan_clauses,
Plan *outer_plan)
{
GriddbFdwRelationInfo *fpinfo = (GriddbFdwRelationInfo *) foreignrel->fdw_private;
Index scan_relid = foreignrel->relid;
List *fdw_private;
List *remote_conds = NIL;
List *remote_exprs = NIL;
List *local_exprs = NIL;
List *params_list = NIL;
List *fdw_scan_tlist = NIL;
List *retrieved_attrs;
StringInfoData sql;
ListCell *lc;
int for_update = 0;
int guc_level = 0;
bool has_limit = false;
RangeTblEntry *rte;
elog(DEBUG1, "griddb_fdw: %s", __func__);
/* Decide to execute function pushdown support in the target list. */
fpinfo->is_tlist_func_pushdown = griddb_is_foreign_function_tlist(root, foreignrel, tlist);
/*
* Get FDW private data created by griddbGetForeignUpperPaths(), if any.
*/
if (best_path->fdw_private)
{
has_limit = intVal(list_nth(best_path->fdw_private, FdwPathPrivateHasLimit));
}
/*
* Separate the scan_clauses into those that can be executed remotely and
* those that can't. baserestrictinfo clauses that were previously
* determined to be safe or unsafe by classifyConditions are shown in
* fpinfo->remote_conds and fpinfo->local_conds. Anything else in the
* scan_clauses list will be a join clause, which we have to check for
* remote-safety.
*
* Note: the join clauses we see here should be the exact same ones
* previously examined by postgresGetForeignPaths. Possibly it'd be worth
* passing forward the classification work done then, rather than
* repeating it here.
*
* This code must match "extract_actual_clauses(scan_clauses, false)"
* except for the additional decision about remote versus local execution.
* Note however that we don't strip the RestrictInfo nodes from the
* remote_conds list, since appendWhereClause expects a list of
* RestrictInfos.
*/
if ((foreignrel->reloptkind == RELOPT_BASEREL ||
foreignrel->reloptkind == RELOPT_OTHER_MEMBER_REL) &&
fpinfo->is_tlist_func_pushdown == false)
{
foreach(lc, scan_clauses)
{
RestrictInfo *rinfo = (RestrictInfo *) lfirst(lc);
Assert(IsA(rinfo, RestrictInfo));
/* Ignore any pseudoconstants, they're dealt with elsewhere */
if (rinfo->pseudoconstant)
continue;
if (list_member_ptr(fpinfo->remote_conds, rinfo))
{
remote_conds = lappend(remote_conds, rinfo);
remote_exprs = lappend(remote_exprs, rinfo->clause);
}
else if (list_member_ptr(fpinfo->local_conds, rinfo))
local_exprs = lappend(local_exprs, rinfo->clause);
else if (griddb_is_foreign_expr(root, foreignrel, rinfo->clause, false))
{
remote_conds = lappend(remote_conds, rinfo);
remote_exprs = lappend(remote_exprs, rinfo->clause);
}
else
local_exprs = lappend(local_exprs, rinfo->clause);
}
}
else
{
/*
* For a join rel, baserestrictinfo is NIL and we are not considering
* parameterization right now, so there should be no scan_clauses for
* a joinrel or an upper rel either.
*/
if (fpinfo->is_tlist_func_pushdown == false)
{
scan_relid = 0;
Assert(!scan_clauses);
}
/*
* Instead we get the conditions to apply from the fdw_private
* structure.
*/
remote_exprs = extract_actual_clauses(fpinfo->remote_conds, false);
local_exprs = extract_actual_clauses(fpinfo->local_conds, false);
if (fpinfo->is_tlist_func_pushdown == true)
{
foreach(lc, tlist)
{
TargetEntry *tle = lfirst_node(TargetEntry, lc);
/*
* Pull out function from FieldSelect clause and add to
* fdw_scan_tlist to push down function portion only
*/
if (fpinfo->is_tlist_func_pushdown == true && IsA((Node *) tle->expr, FieldSelect))
{
fdw_scan_tlist = add_to_flat_tlist(fdw_scan_tlist,
griddb_pull_func_clause((Node *) tle->expr));
}
else
{
fdw_scan_tlist = lappend(fdw_scan_tlist, tle);
}
}
foreach(lc, fpinfo->local_conds)
{
RestrictInfo *rinfo = lfirst_node(RestrictInfo, lc);
fdw_scan_tlist = add_to_flat_tlist(fdw_scan_tlist,
pull_var_clause((Node *) rinfo->clause,
PVC_RECURSE_PLACEHOLDERS));
}
}
else
{
fdw_scan_tlist = griddb_build_tlist_to_deparse(foreignrel);
}
}
/*
* Build the query string to be sent for execution, and identify
* expressions to be sent as parameters.
*/