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There is a number of tests against median() UDAF. After 10.3 merging the tests complain in this way and queries use the median() UDAF fails afterwards with a syntax error:
MariaDB [tpch1]> CREATE OR REPLACE AGGREGATE FUNCTION median returns REAL soname 'libudf_mysql.so';
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ERROR 1585 (HY000): This function 'median' has the same name as a native function
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MariaDB [tpch1]> select l_shipmode,avg_mode(l_extendedprice),l_shipmode,median(l_extendedprice) from lineitem group by l_shipmode order by l_shipmode;
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ERROR 1064 (42000): You have an error in your SQL syntax; check the manual that corresponds to your MariaDB server version for the right syntax to use near 'from lineitem group by l_shipmode order by l_shipmode' at line 1
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MariaDB [tpch1]>
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