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cache_size= (extra_arg ? *(uint32_t*) extra_arg :
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123
(READ_CACHE_USED | WRITE_CACHE_USED | OPT_NO_ROWS)) &&
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!share->state.header.uniques)
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if (!(init_io_cache(&info->rec_cache,info->dfile, cache_size,
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(bool) (info->lock_type != F_UNLCK),
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128
MYF(share->write_flag & MY_WAIT_IF_FULL))))