class_docstr: The set of changes contained in a changelog.
class_docstr_tok: ["The","set","of","changes","contained","in","a","changelog","."]
code: def upsert():
      gateway = get_gateway()
      return ChangelogMode(
          gateway.jvm.org.apache.flink.table.connector.ChangelogMode.upsert()
      )
  
imports: from pyflink.java_gateway import get_gateway
label_desc: Use image node_id 3 for calling the ChangelogMode obj's underlying member method code with example usage: obj.upsert() and returns: ChangelogMode