Add toString function. (#7770)

Co-authored-by: qiulu3 <Lucas209910>

shardingsphere-scaling/shardingsphere-scaling-core/src/main/java/org/apache/shardingsphere/scaling/core/execute/executor/record/Column.java

@@ -34,4 +34,9 @@ public final class Column {
     private final boolean updated;
     
     private final boolean primaryKey;
+    
+    @Override
+    public String toString() {
+        return String.format("%s=%s", name, value);
+    }
 }

shardingsphere-scaling/shardingsphere-scaling-core/src/main/java/org/apache/shardingsphere/scaling/core/execute/executor/record/DataRecord.java

@@ -17,6 +17,7 @@
 
 package org.apache.shardingsphere.scaling.core.execute.executor.record;
 
+import lombok.ToString;
 import org.apache.shardingsphere.scaling.core.job.position.Position;
 
 import lombok.EqualsAndHashCode;
@@ -33,6 +34,7 @@ import java.util.List;
 @Setter
 @Getter
 @EqualsAndHashCode(of = {"tableName", "primaryKeyValue"}, callSuper = false)
+@ToString
 public final class DataRecord extends Record {
     
     private final List<Column> columns;