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From GitBox <...@apache.org>
Subject [GitHub] [drill] cgivre commented on a change in pull request #2069: DRILL-7723 - Add Excel Metadata as Implicit Fields
Date Fri, 12 Jun 2020 15:48:23 GMT

cgivre commented on a change in pull request #2069:
URL: https://github.com/apache/drill/pull/2069#discussion_r439499328

File path: contrib/format-excel/src/main/java/org/apache/drill/exec/store/excel/ExcelBatchReader.java
@@ -56,60 +61,70 @@
   private static final Logger logger = org.slf4j.LoggerFactory.getLogger(ExcelBatchReader.class);
   private static final String SAFE_WILDCARD = "_$";
   private static final String SAFE_SEPARATOR = "_";
   private static final String PARSER_WILDCARD = ".*";
   private static final String HEADER_NEW_LINE_REPLACEMENT = "__";
   private static final String MISSING_FIELD_NAME_HEADER = "field_";
-  private static final int ROW_CACHE_SIZE = 100;
+    _category,

Review comment:
   To clarify, the fields here are metadata fields and I wanted to make sure that they do
not conflict with fields that might actually be in the users' data.  It is a fairly standard
practice to begin metadata fields with an `_`.  I've seen this done in many other platforms.
   In any event, how would you like me to proceed with this?

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