Github user chenliang613 commented on a diff in the pull request:
https://github.com/apache/incubator-carbondata/pull/729#discussion_r109636424
--- Diff: format/src/main/thrift/carbondata.thrift ---
@@ -1,223 +1,226 @@
-/**
- * Licensed to the Apache Software Foundation (ASF) under one
- * or more contributor license agreements. See the NOTICE file
- * distributed with this work for additional information
- * regarding copyright ownership. The ASF licenses this file
- * to you under the Apache License, Version 2.0 (the
- * "License"); you may not use this file except in compliance
- * with the License. You may obtain a copy of the License at
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements. See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You under the Apache License, Version 2.0
+ * (the "License"); you may not use this file except in compliance with
+ * the License. You may obtain a copy of the License at
*
- * http://www.apache.org/licenses/LICENSE-2.0
+ * http://www.apache.org/licenses/LICENSE-2.0
*
- * Unless required by applicable law or agreed to in writing,
- * software distributed under the License is distributed on an
- * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
- * KIND, either express or implied. See the License for the
- * specific language governing permissions and limitations
- * under the License.
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
*/
/**
- * File format description for the carbon file format
+ * File format description for the CarbonData file format
*/
namespace java org.apache.carbondata.format
include "schema.thrift"
include "dictionary.thrift"
/**
-* Information about a segment, that represents one data load
-*/
+ * Information about a segment, that represents one data load
+ */
struct SegmentInfo{
- 1: required i32 num_cols; // Number of columns in this load, because
schema can evolve . TODO: Check whether this is really required
+ 1: required i32 num_cols; // Number of columns in this load, because
schema can evolve, different segments may have different columns
2: required list<i32> column_cardinalities; // Cardinality of columns
}
/**
-* Btree index of one blocklet
-*/
+ * Btree index of one blocklet
+ */
struct BlockletBTreeIndex{
1: required binary start_key; // Bit-packed start key of one blocklet
- 2: required binary end_key; // Bit-packed start key of one blocklet
+ 2: required binary end_key; // Bit-packed end key of one blocklet
}
/**
-* Min-max index of one blocklet
-*/
+ * Min-max index of one blocklet
+ */
struct BlockletMinMaxIndex{
1: required list<binary> min_values; //Min value of all columns of one
blocklet Bit-Packed
2: required list<binary> max_values; //Max value of all columns of one
blocklet Bit-Packed
}
/**
-* Index of one blocklet
-**/
+ * Index of one blocklet
+ */
struct BlockletIndex{
1: optional BlockletMinMaxIndex min_max_index;
2: optional BlockletBTreeIndex b_tree_index;
}
/**
-* Sort state of one column
-*/
+ * Sort state of one column
+ */
enum SortState{
SORT_NONE = 0; // Data is not sorted
SORT_NATIVE = 1; //Source data was sorted
SORT_EXPLICIT = 2; // Sorted (ascending) when loading
}
/**
-* Compressions supported by Carbon Data.
-*/
+ * Compressions supported by CarbonData.
+ */
enum CompressionCodec{
SNAPPY = 0;
}
/**
-* Represents the data of one dimension one dimension group in one blocklet
-*/
-// add a innger level placeholder for further I/O granulatity
+ * Represents the data of one column page or one column page group in one
blocklet.
--- End diff --
agree
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