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Summary

Range returned by merged reading should not be used as the corresponding parts of table data cache key,
instead offset and len of column meta should be used.

range.start is not stable and can vary for the same column depending on the query's projection.

For instance:

• SELECT col1, col2 FROM t;
• SELECT col2 FROM t;

may result in different ranges for col2, this can lead to cache missing or INCONSISTENCIES

Tests

• Unit Test
• Logic Test
• Benchmark Test
• No Test - Ensure consistent cache key through code refactoring.

Type of change

• Bug Fix (non-breaking change which fixes an issue)
• New Feature (non-breaking change which adds functionality)
• Breaking Change (fix or feature that could cause existing functionality not to work as expected)
• Documentation Update
• Refactoring
• Performance Improvement
• Other (please describe):

This change is