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1 - force MRR when the storage engine is capable of doing it
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/* A bitmap for switching optimizations on/off */
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ulong read_rnd_buff_size;
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/* Determines which non-standard SQL behaviour should be enabled */
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uint32_t default_week_format;
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uint32_t query_alloc_block_size;
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uint32_t query_prealloc_size;
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uint32_t trans_alloc_block_size;
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uint32_t trans_prealloc_size;
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In slave thread we need to know in behalf of which
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thread the query is being run to replicate temp tables properly