[core] add data-evolution info to Files System Table. (#6986)

Author: steFaiz

paimon-core/src/main/java/org/apache/paimon/table/system/FilesTable.java

@@ -22,6 +22,7 @@
 import org.apache.paimon.casting.CastExecutors;
 import org.apache.paimon.data.BinaryRow;
 import org.apache.paimon.data.BinaryString;
+import org.apache.paimon.data.GenericArray;
 import org.apache.paimon.data.GenericRow;
 import org.apache.paimon.data.InternalArray;
 import org.apache.paimon.data.InternalRow;
@@ -117,7 +118,9 @@ public class FilesTable implements ReadonlyTable {
                             new DataField(14, "max_sequence_number", new BigIntType(true)),
                             new DataField(15, "creation_time", DataTypes.TIMESTAMP_MILLIS()),
                             new DataField(16, "deleteRowCount", DataTypes.BIGINT()),
-                            new DataField(17, "file_source", DataTypes.STRING())));
+                            new DataField(17, "file_source", DataTypes.STRING()),
+                            new DataField(18, "first_row_id", DataTypes.BIGINT()),
+                            new DataField(19, "write_cols", DataTypes.ARRAY(DataTypes.STRING()))));
 
     private final FileStoreTable storeTable;
 
@@ -435,7 +438,16 @@ private LazyGenericRow toRow(
                         () -> file.deleteRowCount().orElse(null),
                         () ->
                                 BinaryString.fromString(
-                                        file.fileSource().map(FileSource::toString).orElse(null))
+                                        file.fileSource().map(FileSource::toString).orElse(null)),
+                        file::firstRowId,
+                        () -> {
+                            List<String> writeCols = file.writeCols();
+                            if (writeCols == null) {
+                                return null;
+                            }
+                            return new GenericArray(
+                                    writeCols.stream().map(BinaryString::fromString).toArray());
+                        },
                     };
 
             return new LazyGenericRow(fields);

paimon-core/src/test/java/org/apache/paimon/table/system/FilesTableTest.java

@@ -222,7 +222,9 @@ private List<InternalRow> getExpectedResult(long snapshotId) {
                             file.creationTime(),
                             file.deleteRowCount().orElse(null),
                             BinaryString.fromString(
-                                    file.fileSource().map(Object::toString).orElse(null))));
+                                    file.fileSource().map(Object::toString).orElse(null)),
+                            file.firstRowId(),
+                            null));
         }
         return expectedRow;
     }