Antalya 26.3 Backport of #102628 - Fix LOGICAL_ERROR crash in Parquet reader for nullable columns with filter

[mkmkme]

Fix LOGICAL_ERROR crash in Parquet reader for nullable columns with filter

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):

Fix LOGICAL_ERROR crash "Unexpected number of rows in column subchunk" in native Parquet V3 reader when reading nullable columns with a WHERE filter (ClickHouse#102628 by @groeneai).

Documentation entry for user-facing changes

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CI/CD Options

Exclude tests:

• Fast test
• Integration Tests
• Stateless tests
• Stateful tests
• Performance tests
• All with ASAN
• All with TSAN
• All with MSAN
• All with UBSAN
• All with Coverage
• All with Aarch64
• All Regression
• Disable CI Cache

Regression jobs to run:

• Fast suites (mostly <1h)
• Aggregate Functions (2h)
• Alter (1.5h)
• Benchmark (30m)
• ClickHouse Keeper (1h)
• Iceberg (2h)
• LDAP (1h)
• Parquet (1.5h)
• RBAC (1.5h)
• SSL Server (1h)
• S3 (2h)
• S3 Export (2h)
• Swarms (30m)
• Tiered Storage (2h)

[github-actions]

Workflow [PR], commit [6d92950]

[il9ue]

LGTM — seems like clean backport ✅

Diff matches upstream #102628. Two fixes in Reader.cpp:

1. Gate use_filter_in_decoder on !column.need_null_map. The fast path processes all rows through processDefLevelsForInnermostColumn and applies the filter at encoded-value indices, which don't line up 1:1 with row indices when nulls are present. Fall-back to the standard row-range path is correct.

2. Inverted memchr: 0 → 1. ClickHouse convention is 1 = NULL, so the old check cleared the null_map whenever any non-null existed — exactly backwards. With all-NULL filtered rows into a non-Nullable column at null_as_default=0, this silently dropped the map instead of raising CANNOT_INSERT_NULL_IN_ORDINARY_COLUMN, then crashed downstream on the row-count mismatch.

Test covers all four meaningful cases (nullable output, null_as_default=1, the formerly-crashing path, and a no-nulls control). Correctly gated on input_format_parquet_use_native_reader_v3=1.

CI selection appropriate (Parquet/Iceberg/S3 Export, ASAN kept). Approve once green.