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sql_alloc() has additional costs compared to direct mem_root allocation:
- function call: it is defined in a separate translation unit and can't be inlined
- it needs to call pthread_getspecific() to get THD::mem_root
It is called dozens of times implicitly by Items. Try to get rid of those calls.
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MDEV-6152 Remove calls to current_thd while creating Item
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Review done per email. Please fix the very few issues and then ok to push
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Michael Widenius, please review attached patch.