[GitHub] [carbondata] Indhumathi27 commented on a change in pull request #3301: [CARBONDATA-3446] Support read schema of complex data type from carbon file folder path

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Indhumathi27 commented on a change in pull request #3301:
URL: https://github.com/apache/carbondata/pull/3301#discussion_r416476342



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File path: sdk/sdk/src/main/java/org/apache/carbondata/sdk/file/CarbonSchemaReader.java
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@@ -283,6 +280,96 @@ public static Schema readSchemaInIndexFile(String indexFilePath) throws IOExcept
     return readSchema(indexFilePath, false);
   }
 
+  public static StructField getStructChildren(CarbonTable table, String columnName) {
+    List<CarbonDimension> list = table.getChildren(columnName);
+    List<StructField> structFields = new ArrayList<StructField>();
+    for (int i = 0; i < list.size(); i++) {
+      CarbonDimension carbonDimension = list.get(i);
+      if (DataTypes.isStructType(carbonDimension.getDataType())) {
+        return getStructChildren(table, carbonDimension.getColName());
+      } else if (DataTypes.isArrayType(carbonDimension.getDataType())) {
+        return getArrayChildren(table, carbonDimension.getColName());
+      } else if (DataTypes.isMapType(carbonDimension.getDataType())) {
+        //TODO
+      } else {
+        ColumnSchema columnSchema = carbonDimension.getColumnSchema();
+        structFields.add(new StructField(columnSchema.getColumnName(), columnSchema.getDataType()));
+      }
+    }
+    return new StructField(columnName, DataTypes.createStructType(structFields));
+  }
+
+  public static StructField getArrayChildren(CarbonTable table, String columnName) {
+    List<CarbonDimension> list = table.getChildren(columnName);
+    List<StructField> structFields = new ArrayList<StructField>();
+    for (int i = 0; i < list.size(); i++) {
+      CarbonDimension carbonDimension = list.get(i);
+      if (DataTypes.isStructType(carbonDimension.getDataType())) {
+        return getStructChildren(table, carbonDimension.getColName());
+      } else if (DataTypes.isArrayType(carbonDimension.getDataType())) {
+        return getArrayChildren(table, carbonDimension.getColName());
+      } else if (DataTypes.isMapType(carbonDimension.getDataType())) {
+        //TODO
+      } else {
+        ColumnSchema columnSchema = carbonDimension.getColumnSchema();
+        structFields.add(new StructField(columnSchema.getColumnName(), columnSchema.getDataType()));
+      }
+    }
+    return structFields.get(0);
+  }
+
+  /**
+   * Read schema from carbon file folder path
+   *
+   * @param folderPath carbon file folder path
+   * @param conf       hadoop configuration support, can set s3a AK,SK,
+   *                   end point and other conf with this
+   * @return carbon data Schema
+   * @throws IOException
+   */
+  private static Schema readSchemaFromFolder(String folderPath, Configuration conf)
+    throws IOException {
+    String tableName = "UnknownTable" + UUID.randomUUID();
+    CarbonTable table = CarbonTable.buildTable(folderPath, tableName, conf);
+    List<ColumnSchema> columnSchemaList = table.getTableInfo().getFactTable().getListOfColumns();
+    int sum = 0;
+    for (ColumnSchema columnSchema : columnSchemaList) {
+      if (!(columnSchema.getColumnName().contains("."))) {
+        sum++;
+      }
+    }
+    Field[] fields = new Field[sum];
+
+    int indexOfFields = 0;
+    for (ColumnSchema columnSchema : table.getTableInfo().getFactTable().getListOfColumns()) {

Review comment:
       we already have a variable `columnSchemaList`. can use it instead of `table.getTableInfo().getFactTable().getListOfColumns()`




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