pjfanning commented on a change in pull request #2428:
URL: https://github.com/apache/drill/pull/2428#discussion_r785376059
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File path:
contrib/format-excel/src/main/java/org/apache/drill/exec/store/excel/ExcelBatchReader.java
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@@ -364,6 +368,27 @@ private void getColumnHeaders(SchemaBuilder builder) {
builder.buildSchema();
}
+ /**
+ * This function verifies whether a given column name is already present in
the projected schema.
+ * If so, it appends _n to the column name. N will be incremented for every
duplicate column
+ * @param columnName The original column
+ * @return The deconflicted column name
+ */
+ private String deconflictColumnNames(String columnName) {
+ Pattern pattern = Pattern.compile("_(\\d+)$");
+ Matcher matcher = pattern.matcher(columnName);
+ while (excelFieldNames.contains(columnName)) {
Review comment:
Does case matter because `contains` is case sensitive? - so if col1 is
called 'Column' and col2 is called 'column' then this code won't rename col2.
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