Update indxpath.cpp

src/gausskernel/optimizer/path/indxpath.cpp

@@ -743,6 +743,16 @@ static void get_index_paths(
     }
 }
 
+/*
+ * function name: index_relation_has_bucket
+ * description: This function checks if an index relation has a bucket.
+ * arguments:
+ *   - `index`: The IndexOptInfo structure representing the index.
+ * return value: A boolean indicating whether the index relation has a bucket (true) or not (false).
+ * note: This function opens the underlying heap relation of the index to check for the presence of a bucket.
+ * date: 2023/8/16
+ * contact tel: 18720816902
+ */
 static inline bool index_relation_has_bucket(IndexOptInfo* index)
 {
     Assert(index != NULL);
@@ -753,6 +763,16 @@ static inline bool index_relation_has_bucket(IndexOptInfo* index)
     return hasBucket;
 }
 
+/*
+ * function name: IsEqRestrict
+ * description: This function checks if a RestrictInfo represents an equality restriction.
+ * arguments:
+ *   - `rinfo`: The RestrictInfo structure representing the restriction.
+ * return value: A boolean indicating whether the restriction is an equality restriction (true) or not (false).
+ * note: The function checks if the given clause is an equality operator clause and if the operator's result type is EQSELRETURNOID.
+ * date: 2023/8/16
+ * contact tel: 18720816902
+ */
 inline bool IsEqRestrict(const RestrictInfo* rinfo)
 {
     Expr* clause = rinfo->clause;
@@ -814,6 +834,17 @@ void MarkUniqueIndexFirstRule(const RelOptInfo* rel, const IndexOptInfo* index,
     }
 }
 
+/*
+ * function name: PathkeysIsUnusefulForPartition
+ * description: This function checks if the path keys of an index are unuseful for partitioning purposes.
+ * arguments:
+ *   - `index`: The IndexOptInfo structure representing the index.
+ * return value: A boolean indicating whether the path keys are unuseful for partitioning (true) or not (false).
+ * note: The function considers various conditions, including if the index is a partitioned index, if it's global or hypothetical,
+ * and the type of partitioning being used.
+ * date: 2023/8/16
+ * contact tel: 18720816902
+ */
 static bool PathkeysIsUnusefulForPartition(const IndexOptInfo* index)
 {
     if (!index->ispartitionedindex) {