diff options
Diffstat (limited to 'src/include/nodes/plannodes.h')
| -rw-r--r-- | src/include/nodes/plannodes.h | 20 |
1 files changed, 15 insertions, 5 deletions
diff --git a/src/include/nodes/plannodes.h b/src/include/nodes/plannodes.h index 21cbfa8cf0f..baeba2d330f 100644 --- a/src/include/nodes/plannodes.h +++ b/src/include/nodes/plannodes.h @@ -471,7 +471,11 @@ typedef struct WorkTableScan * fdw_exprs and fdw_private are both under the control of the foreign-data * wrapper, but fdw_exprs is presumed to contain expression trees and will * be post-processed accordingly by the planner; fdw_private won't be. - * Note that everything in both lists must be copiable by copyObject(). + * An optional fdw_ps_tlist is used to map a reference to an attribute of + * underlying relation(s) onto a pair of INDEX_VAR and alternative varattno. + * When fdw_ps_tlist is used, this represents a remote join, and the FDW + * is responsible for setting this field to an appropriate value. + * Note that everything in above lists must be copiable by copyObject(). * One way to store an arbitrary blob of bytes is to represent it as a bytea * Const. Usually, though, you'll be better off choosing a representation * that can be dumped usefully by nodeToString(). @@ -480,18 +484,22 @@ typedef struct WorkTableScan typedef struct ForeignScan { Scan scan; + Oid fdw_handler; /* OID of FDW handler */ List *fdw_exprs; /* expressions that FDW may evaluate */ + List *fdw_ps_tlist; /* tlist, if replacing a join */ List *fdw_private; /* private data for FDW */ + Bitmapset *fdw_relids; /* RTIs generated by this scan */ bool fsSystemCol; /* true if any "system column" is needed */ } ForeignScan; /* ---------------- * CustomScan node * - * The comments for ForeignScan's fdw_exprs and fdw_private fields apply - * equally to custom_exprs and custom_private. Note that since Plan trees - * can be copied, custom scan providers *must* fit all plan data they need - * into those fields; embedding CustomScan in a larger struct will not work. + * The comments for ForeignScan's fdw_exprs, fdw_varmap and fdw_private fields + * apply equally to custom_exprs, custom_ps_tlist and custom_private. + * Note that since Plan trees can be copied, custom scan providers *must* + * fit all plan data they need into those fields; embedding CustomScan in + * a larger struct will not work. * ---------------- */ struct CustomScan; @@ -512,7 +520,9 @@ typedef struct CustomScan Scan scan; uint32 flags; /* mask of CUSTOMPATH_* flags, see relation.h */ List *custom_exprs; /* expressions that custom code may evaluate */ + List *custom_ps_tlist;/* tlist, if replacing a join */ List *custom_private; /* private data for custom code */ + Bitmapset *custom_relids; /* RTIs generated by this scan */ const CustomScanMethods *methods; } CustomScan; |