Avoid generating triples with empty values.

MaastrichtU-IDS · Nov 14, 2018 · 8c3078c · 8c3078c
1 parent e71b529
commit 8c3078c
Showing 1 changed file with 2 additions and 1 deletion.
diff --git a/src/main/java/nl/unimaas/ids/autorml/mappers/DrillMapper.java b/src/main/java/nl/unimaas/ids/autorml/mappers/DrillMapper.java
@@ -138,7 +138,8 @@ public String getSqlForRowNum() {
 
  	@Override
 	public String getSqlForColumn(String column, int index) {
-		return "columns[" + index + "] as `" + getColumnName(column) + "`";
+ 		// Avoid generating triples with empty values
+ 		return "NULLIF(trim(columns[" + index + "]), '') as `" + getColumnName(column) + "`";
 	}
 
 }