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shesek=> CREATE AGGREGATE array_accum (anyelement)
shesek-> (
shesek(>     sfunc = array_append,
shesek(>     stype = anyarray,
shesek(>     initcond = '{}'
shesek(> );
ERROR:  syntax error at or near "(" at character 43
LINE 2: (
        ^
shesek=>