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@ -3268,8 +3268,12 @@ static bool create_ref_for_key(JOIN *join, JOIN_TAB *j, KEYUSE *org_keyuse,
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keyuse,join->const_table_map,
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&keyinfo->key_part[i],
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(char*) key_buff,maybe_null);
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/* Remmeber if we are going to use REF_OR_NULL */
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if (keyuse->optimize & KEY_OPTIMIZE_REF_OR_NULL)
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/*
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Remeber if we are going to use REF_OR_NULL
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But only if field _really_ can be null i.e. we force JT_REF
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instead of JT_REF_OR_NULL in case if field can't be null
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*/
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if ((keyuse->optimize & KEY_OPTIMIZE_REF_OR_NULL) && maybe_null)
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null_ref_key= key_buff;
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key_buff+=keyinfo->key_part[i].store_length;
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}
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