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PranavKTiwari b8cf2323d6 MDEV-28610 : Assertion marked_for_read() failed upon range select with virtual column in index.
Problem:
Executing a range select using an index that includes virtual/generated columns
(e.g. SELECT ... WHERE c BETWEEN ... ORDER BY d) could trigger:

Assertion 'marked_for_read()' failed in Field access during execution.

Cause:
The keyread initialization path was populating table->read_set using
mark_index_columns(), which follows the non-recursive index marking path.
This only marks direct index fields and does not resolve dependencies of
virtual/generated columns.

As a result, when an index contained virtual columns, their dependent base
columns were not included in read_set, leading to invalid access during
later evaluation of virtual columns.

Fix:
Replace mark_index_columns() with mark_index_columns_for_read() in the
keyread initialization path. This ensures the recursive read-marking logic is
used, so virtual/generated column dependencies are correctly propagated into
read_set before execution.
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