Details
-
Improvement
-
Status: Resolved
-
Normal
-
Resolution: Fixed
-
None
Description
The Documentation here https://cassandra.apache.org/doc/latest/cassandra/getting-started/vector-search-quickstart.html
doesn't work.
Some example errors, when creating the comments_vs table
instaclustr@cqlsh:cycling> CREATE TABLE IF NOT EXISTS cycling.comments_vs ( ... record_id timeuuid, ... id uuid, ... commenter text, ... comment text, ... comment_vector VECTOR <FLOAT, 5>; SyntaxException: line 6:34 mismatched input ';' expecting ')' (...comment_vector VECTOR <FLOAT, 5>[;]) instaclustr@cqlsh:cycling> created_at timestamp, ... PRIMARY KEY (id, created_at) ... ) ... WITH CLUSTERING ORDER BY (created_at DESC); SyntaxException: line 1:0 no viable alternative at input 'created_at' ([created_at]...) instaclustr@cqlsh:cycling>
Which then breaks all the subsequent commands, some of the later inserts and SELECTS need work even after repairing.
There's a few errors in the CQL commands and table definitions, I managed to get it working in the below CQL.
CREATE KEYSPACE IF NOT EXISTS demo
WITH REPLICATION = { 'class' : 'SimpleStrategy', 'replication_factor' : '1' };
CREATE TABLE IF NOT EXISTS demo.comments_vs (
record_id timeuuid,
id uuid,
commenter text,
comment text,
comment_vector VECTOR <FLOAT, 5>,
created_at timestamp,
PRIMARY KEY (id, created_at)
);
WITH CLUSTERING ORDER BY (created_at DESC);CREATE INDEX IF NOT EXISTS ann_index
ON demo.comments_vs(comment_vector) USING 'sai';
INSERT INTO demo.comments_vs (record_id, id, created_at, comment, commenter, comment_vector)
VALUES (
now(),
e7ae5cf3-d358-4d99-b900-85902fda9bb0,
'2017-03-21 13:11:09.999-0800',
'Second rest stop was out of water',
'Alex',
[0.99, 0.5, 0.99, 0.1, 0.34]
);
INSERT INTO demo.comments_vs (record_id, id, created_at, comment, commenter, comment_vector)
VALUES (
now(),
e7ae5cf3-d358-4d99-b900-85902fda9bb0,
'2017-04-01 06:33:02.16-0800',
'LATE RIDERS SHOULD NOT DELAY THE START',
'Alex',
[0.9, 0.54, 0.12, 0.1, 0.95]
);
INSERT INTO demo.comments_vs (record_id, id, created_at, comment, commenter, comment_vector)
VALUES (
now(),
c7fceba0-c141-4207-9494-a29f9809de6f,
totimestamp(now()),
'The gift certificate for winning was the best',
'Amy',
[0.13, 0.8, 0.35, 0.17, 0.03]
);
INSERT INTO demo.comments_vs (record_id, id, created_at, comment, commenter, comment_vector)
VALUES (
now(),
c7fceba0-c141-4207-9494-a29f9809de6f,
'2017-02-17 12:43:20.234+0400',
'Glad you ran the race in the rain',
'Amy',
[0.3, 0.34, 0.2, 0.78, 0.25]
);
INSERT INTO demo.comments_vs (record_id, id, created_at, comment, commenter, comment_vector)
VALUES (
now(),
c7fceba0-c141-4207-9494-a29f9809de6f,
'2017-03-22 5:16:59.001+0400',
'Great snacks at all reststops',
'Amy',
[0.1, 0.4, 0.1, 0.52, 0.09]
);
INSERT INTO demo.comments_vs (record_id, id, created_at, comment, commenter, comment_vector)
VALUES (
now(),
c7fceba0-c141-4207-9494-a29f9809de6f,
'2017-04-01 17:43:08.030+0400',
'Last climb was a killer',
'Amy',
[0.3, 0.75, 0.2, 0.2, 0.5]
);
SELECT * FROM demo.comments_vs
ORDER BY comment_vector ANN OF [0.15, 0.1, 0.1, 0.35, 0.55]
LIMIT 3;
SELECT comment, similarity_cosine(comment_vector, [0.2, 0.15, 0.3, 0.2, 0.05])
FROM demo.comments_vs
ORDER BY comment_vector ANN OF [0.1, 0.15, 0.3, 0.12, 0.05]
LIMIT 1;
Just raising a ticket to link for a website PR.
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