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scylladb/test/boost
Piotr Sarna 526ad2a151 Merge 'secondary_index: Fix TOKEN() restrictions in indexed SELECTs' from Jan Ciołek
This is a rewrite of an old PR: #7582

`TOKEN()` restrictions don't work properly when a query uses an index.
For example this returns both rows:
```cql
CREATE TABLE t(pk int, ck int, v int, PRIMARY KEY(pk, ck));
CREATE INDEX ON t(v);
INSERT INTO t (pk, ck, v) VALUES (0, 0, 0);
INSERT INTO t (pk, ck, v) VALUES (1, 0, 0);
SELECT token(pk), pk, ck, v FROM t WHERE v = 0 AND token(pk) = token(0) ALLOW FILTERING;
```

This functionality is supported on both old and new indexes.  In old
indexes the type of the token column was `blob`.  This causes problems,
because `blob` representation of tokens is ordered differently. Tokens
represented as blobs are ordered like this:
```
0, 1, 2, 3, 4, 5, ..., bigint_max, bigint_min, ...., -5, -4, -3, -2, -1
```
Because of that clustering range for `token()` restrictions needs to be
translated to two clustering ranges on the `blob` column.

To create old indexes disable the feature called:
`CORRECT_IDX_TOKEN_IN_SECONDARY_INDEX` or run scylla version from branch
[`cvybhu/si-token2-old-index`](https://github.com/cvybhu/scylla/commits/si-token2-old-index)

I'm not sure if it's possible to create automatic tests with old
indexes. I ran `dev-test` manually on the `si-token2-old-index` branch,
and the only tests that failed were the ones testing row ordering. Rows
should be ordered by `token`, but because in old indexes the token is
represented as a `blob` this ordering breaks. This is a known issue
(#7443), that has been fixed by introducing new indexes.

To sum up:
* `token()` restrictions are fixed on both new and old indexes.
* When using old indexes, the rows are not properly ordered by token.
* With new indexes the rows are properly ordered by token.

Fixes #7043

Closes #9067

* github.com:scylladb/scylla:
  tests: add secondary index tests with TOKEN clause
  secondary_index_test: extract test data
  secondary_index: Fix TOKEN() restrictions in indexed SELECTs
  expression: Add replace_token function
2021-07-22 10:22:45 +02:00
..
2021-07-16 17:25:07 +03:00