INSERT INTO stream_name SELECT select_expr [., ...] FROM from_stream [ WHERE condition ] [ PARTITION BY column_name ] EMIT CHANGES;
Stream the result of the SELECT query into an existing stream and its underlying topic.
The schema and partitioning column produced by the query must match the stream's schema and key, respectively. If the schema and partitioning column are incompatible with the stream, then the statement will return an error.
from_item parameters must both refer to a Stream.
Tables are not supported.
Records written into the stream are not timestamp-ordered with respect to other queries. Therefore, the topic partitions of the output stream may contain out-of-order records even if the source stream for the query is ordered by timestamp.