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The query below is almost instant on MySQL 5.6/5.7, but takes ~15 seconds on any of current MariaDB releases.
SELECT ST_BUFFER(
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ST_UNION(
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MULTILINESTRINGFROMTEXT( ' MULTILINESTRING( ( 3 4 , 2 5 , 7 6 , 1 8 ) , ( 0 0 , 1 6 , 0 1 , 8 9 , 2 4 , 6 1 , 3 5 , 4 8 ) , ( 9 3 , 5 4 , 1 8 , 4 2 , 5 8 , 3 0 ) )' ) ,
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MULTILINESTRINGFROMTEXT( ' MULTILINESTRING( ( 3 4 , 3 1 , 2 7 , 4 2 , 6 2 , 1 5 ) ) ' )
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),
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AREA(
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MULTIPOLYGONFROMTEXT( ' MULTIPOLYGON( ( ( 7 7 , 6 7, 1 5, 7 6 , 7 7 ) ) , ( (0 5, 3 5, 3 4, 1 4 , 1 3 , 3 3 , 3 0 , 0 0 , 0 5), ( 1 1 , 2 1 , 2 2 , 1 2 , 1 1 ) ) ) ' )
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)
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);
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Results are also different, though.
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