[GitHub] [iceberg] jackye1995 commented on a change in pull request #2701: Hive: support create table with partition transform through table property

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jackye1995 commented on a change in pull request #2701:
URL: https://github.com/apache/iceberg/pull/2701#discussion_r655673144



##########
File path: mr/src/main/java/org/apache/iceberg/mr/hive/HiveIcebergPartitionTextParser.java
##########
@@ -0,0 +1,112 @@
+/*
+ * 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
+ *
+ * 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.
+ */
+
+package org.apache.iceberg.mr.hive;
+
+import java.util.function.BiConsumer;
+import java.util.function.Consumer;
+import java.util.regex.Matcher;
+import java.util.regex.Pattern;
+import org.apache.iceberg.PartitionSpec;
+import org.apache.iceberg.Schema;
+import org.apache.iceberg.exceptions.ValidationException;
+
+/**
+ * Parser for inputs received from config {@link org.apache.iceberg.mr.InputFormatConfig#PARTITIONING}
+ */
+class HiveIcebergPartitionTextParser {
+  private static final int PARTITION_TEXT_MAX_LENGTH = 1000;
+
+  private static final Pattern BUCKET_PATTERN = Pattern.compile("bucket\\((.*?),(.*?)\\)", Pattern.CASE_INSENSITIVE);
+  private static final Pattern TRUNCATE_PATTERN = Pattern.compile(
+      "truncate\\((.*?),(.*?)\\)", Pattern.CASE_INSENSITIVE);
+  private static final Pattern YEAR_PATTERN = Pattern.compile("year\\((.*?)\\)", Pattern.CASE_INSENSITIVE);
+  private static final Pattern MONTH_PATTERN = Pattern.compile("month\\((.*?)\\)", Pattern.CASE_INSENSITIVE);
+  private static final Pattern DAY_PATTERN = Pattern.compile("day\\((.*?)\\)", Pattern.CASE_INSENSITIVE);
+  private static final Pattern HOUR_PATTERN = Pattern.compile("hour\\((.*?)\\)", Pattern.CASE_INSENSITIVE);
+  private static final Pattern ALWAYS_NULL_PATTERN = Pattern.compile(
+      "alwaysNull\\((.*?)\\)", Pattern.CASE_INSENSITIVE);
+  private static final String INTEGER_PATTERN = "\\d+";
+  private static final String PIPE_DELIMITER = "\\|";
+
+  private HiveIcebergPartitionTextParser() {
+  }
+
+  private static boolean build2ArgTransform(Pattern transformPattern, Schema schema,
+                                         BiConsumer<String, Integer> transformBuilder, String trimmedPart) {
+    Matcher matcher = transformPattern.matcher(trimmedPart);
+    if (matcher.find()) {
+      ValidationException.check(matcher.groupCount() == 2 && matcher.group(2).trim().matches(INTEGER_PATTERN),
+          "Cannot parse 2-arg partition transform from text part: %s", trimmedPart);
+
+      String columnName = matcher.group(1).trim();
+      ValidationException.check(schema.findField(columnName) != null,

Review comment:
       Yeah agree, these can always be caught by the partition spec builder, but I was thinking it might be better to fail fast. Let me think about it more for what is the best line to cut here.




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