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

[GitBox <gi...@apache.org>]

pvary commented on a change in pull request #2701:
URL: https://github.com/apache/iceberg/pull/2701#discussion_r656897535



##########
File path: mr/src/main/java/org/apache/iceberg/mr/hive/HiveIcebergPartitionTextParser.java
##########
@@ -0,0 +1,111 @@
+/*
+ * 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.relocated.com.google.common.base.Preconditions;
+
+/**
+ * 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, BiConsumer<String, Integer> transformBuilder,
+                                            String trimmedPart, int intArgPos) {
+    Matcher matcher = transformPattern.matcher(trimmedPart);
+    if (matcher.find()) {
+      Preconditions.checkArgument(matcher.groupCount() == 2,
+          "Cannot parse 2-arg partition transform from text part: %s", trimmedPart);
+
+      String intArg = matcher.group(intArgPos).trim();
+      Preconditions.checkArgument(intArg.matches(INTEGER_PATTERN),
+          "Cannot find integer as argument %s in 2-arg partition transform: %s", intArgPos, trimmedPart);
+      int transformArg = Integer.parseInt(matcher.group(intArgPos).trim());
+
+      String columnName = matcher.group(intArgPos % 2 + 1).trim();
+      transformBuilder.accept(columnName, transformArg);
+      return true;
+    }
+
+    return false;
+  }
+
+  private static boolean build1ArgTransform(Pattern transformPattern, Consumer<String> transformBuilder,
+                                            String trimmedPart) {
+    Matcher matcher = transformPattern.matcher(trimmedPart);
+    if (matcher.find()) {
+      Preconditions.checkArgument(matcher.groupCount() == 1,
+          "Cannot parse 1-arg partition transform from text part: %s", trimmedPart);
+      String columnName = matcher.group(1).trim();
+      transformBuilder.accept(columnName);
+      return true;
+    }
+
+    return false;
+  }
+
+  public static PartitionSpec fromText(Schema schema, String text) {
+    Preconditions.checkArgument(text.length() < PARTITION_TEXT_MAX_LENGTH,
+        "Partition spec text too long: max allowed length %s, but got %s",
+        PARTITION_TEXT_MAX_LENGTH, text.length());
+    String[] parts = text.split(PIPE_DELIMITER);

Review comment:
       As @marton-bod pointed out in one of our discussions, there is a possibility to have columns with special characters in the column names, like `,|` etc. See: [HIVE-25222](https://issues.apache.org/jira/browse/HIVE-25222) - Fix reading Iceberg tables with a comma in column names.




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