Implement multiple label #1785
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Implement multiple label #1785
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It represents label expression of different type: empty, single or multiple.
Previously, label field was char* type. The change affected the type cypher_node, cypher_relationship and cypher_target_node. As well as, any places where these types are used.
Supports queries like-
MATCH (v:A|B|C) RETURN v
MATCH ()-[e:A|B|C]->() RETURN v
Some examples of supported multiple label queries: CREATE (:a:b) MERGE (:a:b) MATCH (:a:b) MATCH (:a|b) See regress/sql/multiple_label.sql for more details on what kind of queries are supported. Change summary: --------------- * A new column `allrelations` is added to ag_label catalog * Change in creating AGE relations logic * Change in MATCH's transformation logic (related to building parse namespace item)
The logic for building vertex objects is updated. Agtype vertex objects can be built from either a single label (as a cstring) or multiple labels (as an agtype array). The following functions are updated to reflect this- agtype_typecast_vertex, agtype_in and _agtype_build_vertex. if _agtype_build_vertex is called from SQL, its label argument must be explicitly cast to avoid ambiguity in function overload. The `_label_names` function is added to extract label names from a vertex ID as a list of string. It is used as a helper function to build vertex objects. A new cache called `allrelations` is also added. This is used by _label_names to search for all labels that are related to a given relation. Multiple helper functions are added to extract label infromation from an entity ID. For example, entity's relation ID, relation name, label names. These are used by CREATE, DELETE, MERGE, VLE and SET executors for building a vertex's object or updating its relation. All test files are updated to show the label field as an array in the output. In all test SQLs, _agtype_build_vertex's label argument is explicity cast.
It updates the function filter_vertices_on_label_id(). Additional changes: ------------------- - Add internal function _label_ids
Cache issues fixed: ------------------- - Use of wrong data type for cache entry in label relation cache (pre-existing) - Use of wrong update function for catalog table (related to multiple label) Other changes: -------------- - The function _label_name() is unsupported for vertices
Changes: -------- - Update create_label_expr_relations() to return RangeVar. It removes redundant call to label_expr_relname() in the code that also calls this function. - Use deconstruct_array() to convert ArrayType* to List* - Update test files after rebase
This fixes some compile-time errors that occur if PostgreSQL is configured with the --with-llvm option.
Changes: ------- * Include missing header files * Update newly added tests * Other minor changes
Following PRs are reapplied: 1465, 1509, 1514, and 1518.
rafsun42
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rafsun42
requested review from
MuhammadTahaNaveed,
Zainab-Saad,
jrgemignani and
dehowef
Zainab-Saad
requested changes
Apr 29, 2024
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| #include "postgres.h" | |||
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Missing Apache License header
| ListCell *lc; | ||
| char *relname; | ||
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| Assert(list_length(label_expr->label_names) > 1); |
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CREATE (x:A:A) RETURN x results in server termination at this Assertion..
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Ah! I remember you reported this one before. I will fix it.
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@rafsun42 Looks good to me-- this seems to be a really big change seeing that it affects the regression tests in a large way. I think it should be a priority to get this reviewed by as many people as possible, so that development can continue. @jrgemignani mind taking a look? |
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Add support for multiple labels in CREATE, MERGE and MATCH clause.
Important Notes: