MDEV-40572/MDEV-40165 postfix - JSON handling fixes - #5479
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grooverdan wants to merge 3 commits into
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on a truncated nested JSON object with different character sets/collations. The json_engine wasn't cleared between reuse. Also the value->s.c_str and js->s.c_str became invalid once the function returned.
never use item->null_value before this item is evaluated followup for 14c16e0
Adds test cases that validate the incorrect null handling in the previous commmit and other JSON_EQUALS,CONTAINS/OVERLAPS behaviour.
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A few fixes of regressions.