MDEV-38801 Item_sum & Item_cache implement deep_copy() - #5536
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mariadb-RexJohnston wants to merge 1 commit into
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MDEV-38801 Item_sum & Item_cache implement deep_copy()#5536mariadb-RexJohnston wants to merge 1 commit into
mariadb-RexJohnston wants to merge 1 commit into
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{Item_cache,Item_cache_row,Item_sum}::deep_copy() currently call
shallow_copy_with_checks(). This causes issues when a proper
independent copy is required, e.g. in add_key_part called on a key
with a value containing an item inherited from Item_cache.
We implement a proper deep copy that shares no nodes with the source,
and add a check to the default Item::deep_copy_with_checks to ensure
this.
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{Item_cache,Item_cache_row,Item_sum}::deep_copy() currently call shallow_copy_with_checks(). This causes issues when a proper independent copy is required, e.g. in add_key_part called on a key with a value containing an item inherited from Item_cache. We implement a proper deep copy that shares no nodes with the source, and add a check to the default Item::deep_copy_with_checks to ensure this.