support vector index

[Jant1L]

Support create vector index and query similarity

How to create a vertex which contains vector property： eg： _CALL db.createVertexLabel('person', 'id', 'id', 'int64', false, 'vector', 'floatvector', true); CREATE (n:person {id:2001, vector: [1.0,2.0,3.0]});

Create vector index： vector.AddVectorIndex(label_name, field_name, index_type, vec_dimension, distance_type ,index_spec); eg：for HNSW, it need 2 parameters for index_spec：Max_degree && ef_construction CALL vector.AddVectorIndex('person', 'vector', 'HNSW', 4, 'L2' ,24 , 100);

Delete vector index： vector.DeleteVectorIndex(label_name, field_name, index_type, vec_dimension, distance_type); eg： CALL vector.DeleteVectorIndex('person', 'vector', ' HNSW ', 4, 'L2');

Show vector index： CALL vector.ShowVectorIndex();

Query by using vector index： CALL vector.VectorIndexQuery(label_name, field_name, vector, vec_dimension, query_spec); eg：for HNSW, it need 1 parameter for index_spec：ef_search CALL vector.VectorIndexQuery('person', 'vector', [1,2,3,4], 4, 10);

What support now： VSAG HNSW

TODO: support more vector index algorithm and library

[CLAassistant]

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:white_check_mark: Jant1L
:white_check_mark: PPPoint-t
:white_check_mark: lipanpan03
:x: tugraph

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[CLAassistant]

Thank you for your submission! We really appreciate it. Like many open source projects, we ask that you all sign our Contributor License Agreement before we can accept your contribution.
1 out of 2 committers have signed the CLA.

:white_check_mark: Jant1L
:x: PPPoint-t
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[ljcui]

test case 在哪里？

[PPPoint-t]

test case 在哪里？

submit test case

[ljcui]

MATCH (m:Movie {title: 'Godfather, The'})
CALL db.index.vector.queryNodes('moviePlots', 5, m.embedding)
YIELD node AS movie, score
where movie.title = 'xxxxxx'
RETURN movie, score

参考这种写法，向量查出来的点可以继续配合cypher的其他语法来做逻辑处理。 类似这种的查询需要可以跑通，不然用户层面无法使用。

[ljcui]

这一版，先暂时合并进去。