diff options
Diffstat (limited to 'src/include/nodes/supportnodes.h')
| -rw-r--r-- | src/include/nodes/supportnodes.h | 30 |
1 files changed, 30 insertions, 0 deletions
diff --git a/src/include/nodes/supportnodes.h b/src/include/nodes/supportnodes.h index 7b623d54058..ea774c7ef6a 100644 --- a/src/include/nodes/supportnodes.h +++ b/src/include/nodes/supportnodes.h @@ -39,6 +39,8 @@ typedef struct PlannerInfo PlannerInfo; /* avoid including pathnodes.h here */ typedef struct IndexOptInfo IndexOptInfo; typedef struct SpecialJoinInfo SpecialJoinInfo; typedef struct WindowClause WindowClause; +typedef struct RangeTblFunction RangeTblFunction; /* ditto for parsenodes.h */ +typedef struct HeapTupleData *HeapTuple; /* and htup.h too */ /* * The Simplify request allows the support function to perform plan-time @@ -70,6 +72,34 @@ typedef struct SupportRequestSimplify } SupportRequestSimplify; /* + * The InlineInFrom request allows the support function to perform plan-time + * simplification of a call to its target function that appears in FROM. + * The rules for this are sufficiently different from ordinary expressions + * that it's best to make this a separate request from Simplify. + * + * The planner's PlannerInfo "root" is typically not needed, but can be + * consulted if it's necessary to obtain info about Vars present in + * the given node tree. Beware that root could be NULL in some usages. + * + * "rtfunc" will be a RangeTblFunction node for the support function's target + * function. The call appeared alone (and without ORDINALITY) in FROM. + * + * "proc" will be the HeapTuple for the pg_proc row of the target function. + * + * The result should be a semantically-equivalent SELECT Query tree, + * or NULL if no simplification could be performed. The tree must have + * been passed through parse analysis and rewrite. + */ +typedef struct SupportRequestInlineInFrom +{ + NodeTag type; + + PlannerInfo *root; /* Planner's infrastructure */ + RangeTblFunction *rtfunc; /* Function call to be simplified */ + HeapTuple proc; /* Function definition from pg_proc */ +} SupportRequestInlineInFrom; + +/* * The Selectivity request allows the support function to provide a * selectivity estimate for a function appearing at top level of a WHERE * clause (so it applies only to functions returning boolean). |