hadoop - Presto query Array of Rows -


so have hive external table schema looks :

{ . . `x` string, `y` array<struct<age:string,cid:string,dmt:string>>, `z` string }

so need query column(column "y") array of nested json, can see data of column "y" hive, data in column seems invisible presto, though presto knows schema of field, this:

array(row(age varchar,cid varchar,dmt varchar))

as can see presto knows field array of row.

notes:

1.the table hive external table.

2.i schema of field "y" using odbc driver, data empty, can see in hive : [{"age":"12","cid":"bx21hdg","dmt":"120"}]

3.presto queries hivemetastore schema.

4.table stored parquet format.

so how can see data in field "y" please?


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