REPAIR TABLE ... USE_FRM: Inconsistent "Table" column format (alias vs db.table) in multi-table output

Summary

Under low session memory conditions (max_session_mem_used=8192, executing a multi-table REPAIR TABLE t1, t2 USE_FRM returns a result set with inconsistent namespace formatting in the Table column.

The first row returns the unqualified table alias (t1), while subsequent rows return the fully qualified name (realbug_probe.t2). This breaks consistency contracts for diagnostic outputs and can break automated database administration tools/parsers that expect a uniform db.table format.

Root Cause Analysis

The divergence occurs because the "early error" path uses a different string generation method than the standard admin path:

• send_check_errmsg() (in sql/sql_admin.cc) fetches and stores table->alias only.
• Normal admin result rows generated via mysql_admin_table() correctly build the qualified name: db + . + table_name.

Steps to Reproduce

DROP DATABASE IF EXISTS realbug_probe;

CREATE DATABASE realbug_probe;

USE realbug_probe;

SET SESSION max_session_mem_used=8192;

CREATE TABLE t1(id INT) ENGINE=MyISAM;

CREATE TABLE t2(id INT) ENGINE=MyISAM;

REPAIR TABLE t1, t2 USE_FRM;

Actual Result (Inconsistent)

(Notice the mixing of "t1" and "realbug_probe.t2" in the first column).

Expected Result (Consistent)

All rows in the Table column must use the same naming convention, aligned with other multi-table admin commands. It should be fully qualified: realbug_probe.t1 and realbug_probe.t2.

Controls / Proof of Consistency

If we run the exact same scenario but simply omit USE_FRM, or change the verb to CHECK TABLE, the output is perfectly consistent (using the db.table format):

Control A: Without USE_FRM

REPAIR TABLE t1, t2; 

Result A: Consistent db.table (e.g., realbug_pair.t1 / realbug_pair.t2).

Control B: CHECK TABLE

CHECK TABLE t1, t2;

Result B: Consistent db.table (e.g., realbug_chk.t1 / realbug_chk.t2).

Suggested Fix

Align send_check_errmsg() (or the call sites for repair) to emit the same qualified table identifier string built in mysql_admin_table(), rather than relying solely on TABLE_LIST::alias.