Fix number of dropped granules in EXPLAIN PLAN index=1

[wzb5212]

Fixes #52107
Fixes #52637

CREATE TABLE test_skip_idx
(
    `id` UInt32,
    INDEX name_idx_g2 id TYPE minmax GRANULARITY 2,
    INDEX name_idx_g1 id TYPE minmax GRANULARITY 1
)
ENGINE = MergeTree
ORDER BY tuple()
SETTINGS index_granularity = 1, index_granularity_bytes = 0;

INSERT INTO test_skip_idx SELECT number FROM system.numbers LIMIT 5 OFFSET 1;

EXPLAIN indexes = 1 SELECT * FROM test_skip_idx WHERE id < 2;
┌─explain───────────────────────────────────────┐
│ Expression ((Projection + Before ORDER BY))   │
│   Filter (WHERE)                              │
│     ReadFromMergeTree (default.test_skip_idx) │
│     Indexes:                                  │
│       Skip                                    │
│         Name: name_idx_g2                     │
│         Description: minmax GRANULARITY 2     │
│         Parts: 1/1                            │
│         Granules: 3/5                         │
│       Skip                                    │
│         Name: name_idx_g1                     │
│         Description: minmax GRANULARITY 1     │
│         Parts: 1/1                            │
│         Granules: 1/3                         │
└───────────────────────────────────────────────┘

EXPLAIN indexes = 1 SELECT * FROM test_skip_idx WHERE id < 3;
┌─explain───────────────────────────────────────┐
│ Expression ((Projection + Before ORDER BY))   │
│   Filter (WHERE)                              │
│     ReadFromMergeTree (default.test_skip_idx) │
│     Indexes:                                  │
│       Skip                                    │
│         Name: name_idx_g2                     │
│         Description: minmax GRANULARITY 2     │
│         Parts: 1/1                            │
│         Granules: 3/5                         │
│       Skip                                    │
│         Name: name_idx_g1                     │
│         Description: minmax GRANULARITY 1     │
│         Parts: 1/1                            │
│         Granules: 2/3                         │
└───────────────────────────────────────────────┘


## expected behavior

EXPLAIN indexes = 1 SELECT * FROM test_skip_idx WHERE id < 2;
┌─explain───────────────────────────────────────┐
│ Expression ((Projection + Before ORDER BY))   │
│   Filter (WHERE)                              │
│     ReadFromMergeTree (default.test_skip_idx) │
│     Indexes:                                  │
│       Skip                                    │
│         Name: name_idx_g2                     │
│         Description: minmax GRANULARITY 2     │
│         Parts: 1/1                            │
│         Granules: 2/5                         │
│       Skip                                    │
│         Name: name_idx_g1                     │
│         Description: minmax GRANULARITY 1     │
│         Parts: 1/1                            │
│         Granules: 1/2                         │
└───────────────────────────────────────────────┘

EXPLAIN indexes = 1 SELECT * FROM test_skip_idx WHERE id < 3;
┌─explain───────────────────────────────────────┐
│ Expression ((Projection + Before ORDER BY))   │
│   Filter (WHERE)                              │
│     ReadFromMergeTree (default.test_skip_idx) │
│     Indexes:                                  │
│       Skip                                    │
│         Name: name_idx_g2                     │
│         Description: minmax GRANULARITY 2     │
│         Parts: 1/1                            │
│         Granules: 2/5                         │
│       Skip                                    │
│         Name: name_idx_g1                     │
│         Description: minmax GRANULARITY 1     │
│         Parts: 1/1                            │
│         Granules: 2/2                         │
└───────────────────────────────────────────────┘

Changelog category (leave one):

• Bug Fix (user-visible misbehavior in an official stable release)

Changelog entry (a user-readable short description of the changes that goes to CHANGELOG.md):

Fixed a bug in EXPLAIN PLAN index=1 where the number of dropped granules was incorrect

[clickhouse-ci]

This is an automatic comment. The PR descriptions does not match the template.

Please, edit it accordingly.

The error is: Changelog entry required for category 'Bug Fix (user-visible misbehavior in an official stable release)'

[robot-ch-test-poll1]

This is an automated comment for commit 8365a36 with description of existing statuses. It's updated for the latest CI running
The full report is available here
The overall status of the commit is 🔴 failure

Check name	Description	Status
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[alexey-milovidov]

@wzb5212 why closed?

[wzb5212]

@wzb5212 why closed?

Just a moment, let me check the code.

[wzb5212]

@alexey-milovidov please take a look.