ps : DDL I said is the CREATE TABLE statements. Best, Hang
Hang Ruan <ruanhang1...@gmail.com> 于2023年3月26日周日 21:33写道： > Hi, Jie, > > In Flink, if we want to access a metadata column, we need to declare it in > the DDL. > More details could be found here[1]. > > Best, > Hang > > [1] > https://nightlies.apache.org/flink/flink-docs-release-1.17/docs/dev/table/sql/create/#columns > > Jie Han <tunyu...@gmail.com> 于2023年3月26日周日 14:58写道： > >> Hi community, I want to query a metadata column from my table t. Do I >> need to declare it in the table schema explicitly? >> >> In spark, metadata columns are *hidden* columns, which means we don’t >> need to declare it in the table ddl, we only explicitly reference it in our >> query. For instance, select *, _metadata from t. >> >> >>
