delete unused constructor

Author: KirillKurdyukov

table/src/main/java/tech/ydb/table/description/TableColumn.java

@@ -15,26 +15,15 @@ public class TableColumn {
     private final Type type;
     @Nullable
     private final String family;
-    private final boolean hasDefaultValue;
     @Nullable
     private final PrimitiveValue literalDefaultValue;
     @Nullable
     private final SequenceDescription sequenceDescription;
 
-    public TableColumn(String name, Type type, String family, boolean hasDefaultValue) {
-        this.name = name;
-        this.type = type;
-        this.family = family;
-        this.hasDefaultValue = hasDefaultValue;
-        this.literalDefaultValue = null;
-        this.sequenceDescription = null;
-    }
-
     public TableColumn(String name, Type type, @Nullable String family, PrimitiveValue literalDefaultValue) {
         this.name = name;
         this.type = type;
         this.family = family;
-        this.hasDefaultValue = true;
         this.literalDefaultValue = literalDefaultValue;
         this.sequenceDescription = null;
     }
@@ -43,13 +32,12 @@ public TableColumn(String name, Type type, @Nullable String family, SequenceDesc
         this.name = name;
         this.type = type;
         this.family = family;
-        this.hasDefaultValue = true;
         this.literalDefaultValue = null;
         this.sequenceDescription = sequenceDescription;
     }
 
     public TableColumn(String name, Type type, String family) {
-        this(name, type, family, false);
+        this(name, type, family, (PrimitiveValue) null);
     }
 
     public TableColumn(String name, Type type) {
@@ -65,7 +53,7 @@ public Type getType() {
     }
 
     public boolean hasDefaultValue() {
-        return hasDefaultValue;
+        return literalDefaultValue != null && sequenceDescription != null;
     }
 
     @Nullable

table/src/main/java/tech/ydb/table/impl/BaseSession.java

@@ -839,11 +839,7 @@ private static Result<TableDescription> mapDescribeTable(Result<YdbTable.Describ
             YdbTable.ColumnMeta column = desc.getColumns(i);
             Type type = ProtoType.fromPb(column.getType());
 
-            if (column.hasFromLiteral()) {
-                PrimitiveValue primitiveValue = (PrimitiveValue)
-                        ProtoValue.fromPb(type, column.getFromLiteral().getValue());
-                description.addColumn(new TableColumn(column.getName(), type, column.getFamily(), primitiveValue));
-            } else if (column.hasFromSequence()) {
+            if (column.hasFromSequence()) {
                 YdbTable.SequenceDescription pbSeq = column.getFromSequence();
                 SequenceDescription.Builder sequenceDescriptionBuilder = new SequenceDescription.Builder();
 
@@ -871,9 +867,14 @@ private static Result<TableDescription> mapDescribeTable(Result<YdbTable.Describ
 
                 description.addColumn(new TableColumn(column.getName(), type, column.getFamily(),
                         sequenceDescriptionBuilder.build()));
-            } else {
-                description.addColumn(new TableColumn(column.getName(), type, column.getFamily(), false));
+
+                continue;
             }
+
+            description.addColumn(new TableColumn(column.getName(), type, column.getFamily(),
+                    column.hasFromLiteral() ? (PrimitiveValue)
+                            ProtoValue.fromPb(type, column.getFromLiteral().getValue()) : null)
+            );
         }
         description.setPrimaryKeys(desc.getPrimaryKeyList());
         for (int i = 0; i < desc.getIndexesCount(); i++) {