↓ 2 callersMethodcolumnMatchCostComputes the min cost of matching a before column to an after column (0, 1, or 2). if column name is same and type is same, cost = 0; if column name i
flink-cdc-connect/flink-cdc-pipeline-connectors/flink-cdc-pipeline-connector-postgres/src/main/java/org/apache/flink/cdc/connectors/postgres/utils/SchemaChangeUtil.java:213