• unknown's avatar
    Bug #30639: limit offset,rowcount wraps when rowcount >= 2^32 in windows · 717dba24
    unknown authored
     The parser uses ulonglong to store the LIMIT number. This number
     then is stored into a variable of type ha_rows. ha_rows is either
     4 or 8 byte depending on the BIG_TABLES define from config.h
     So an overflow may occur (and LIMIT becomes zero) while storing an
     ulonglong value in ha_rows.
     Fixed by :
      1. Using the maximum possible value for ha_rows on overflow
      2. Defining BIG_TABLES for the windows builds (to match the others) 
    
    
    include/config-win.h:
      Bug #30639: turn on BIG_TABLES for windows
    mysql-test/r/select.result:
      Bug #30639: test case
    mysql-test/t/select.test:
      Bug #30639: test case
    sql/sql_lex.cc:
      Bug #30639: Use the maximum possible number on overflow 
       of LIMIT. This is valid because there won't be more rows
       anyway.
    717dba24
select.result 114 KB