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Provide readfuncs support for custom scans.

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Commit a0d9f6e434 added this support for
all other plan node types; this fills in the gap.

Since TextOutCustomScan complicates this and is pretty well useless,
remove it.

KaiGai Kohei, with some modifications by me.
This commit is contained in:
Robert Haas
2015-11-12 07:40:31 -05:00
parent 39b9978d9c
commit a05dc4d7fd
4 changed files with 51 additions and 20 deletions
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41
src/backend/nodes/readfuncs.c
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@ -28,6 +28,7 @@
#include <math.h>
#include "fmgr.h"
#include "nodes/parsenodes.h"
#include "nodes/plannodes.h"
#include "nodes/readfuncs.h"
@ -1806,6 +1807,44 @@ _readForeignScan(void)
READ_DONE();
}
/*
* _readCustomScan
*/
static CustomScan *
_readCustomScan(void)
{
READ_LOCALS(CustomScan);
char *library_name;
char *symbol_name;
const CustomScanMethods *methods;
ReadCommonScan(&local_node->scan);
READ_UINT_FIELD(flags);
READ_NODE_FIELD(custom_plans);
READ_NODE_FIELD(custom_exprs);
READ_NODE_FIELD(custom_private);
READ_NODE_FIELD(custom_scan_tlist);
READ_BITMAPSET_FIELD(custom_relids);
/*
* Reconstruction of methods using library and symbol name
*/
token = pg_strtok(&length); /* skip methods: */
token = pg_strtok(&length); /* LibraryName */
library_name = nullable_string(token, length);
token = pg_strtok(&length); /* SymbolName */
symbol_name = nullable_string(token, length);
methods = (const CustomScanMethods *)
load_external_function(library_name, symbol_name, true, NULL);
Assert(strcmp(methods->LibraryName, library_name) == 0 &&
strcmp(methods->SymbolName, symbol_name) == 0);
local_node->methods = methods;
READ_DONE();
}
/*
* ReadCommonJoin
* Assign the basic stuff of all nodes that inherit from Join
@ -2362,6 +2401,8 @@ parseNodeString(void)
return_value = _readWorkTableScan();
else if (MATCH("FOREIGNSCAN", 11))
return_value = _readForeignScan();
else if (MATCH("CUSTOMSCAN", 10))
return_value = _readCustomScan();
else if (MATCH("JOIN", 4))
return_value = _readJoin();
else if (MATCH("NESTLOOP", 8))