presto-postgresql/src/main/java/io/prestosql/plugin/postgresql/PostgreSqlClient.java/PostgreSqlClient/arrayAsJsonColumnMapping
class PostgreSqlClient:    private ColumnMapping arrayAsJsonColumnMapping(ConnectorSession session, ColumnMapping baseElementMapping)
    {
        return ColumnMapping.sliceMapping(
                jsonType,
                arrayAsJsonReadFunction(session, baseElementMapping),
                (statement, index, block) -> { throw new UnsupportedOperationException(); },
                DISABLE_PUSHDOWN);
    }