jcamachor commented on a change in pull request #782: HIVE-22209: Graceful
error msg when there is no table for a materiali…
URL: https://github.com/apache/hive/pull/782#discussion_r327752325
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File path: ql/src/java/org/apache/hadoop/hive/ql/parse/QB.java
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@@ -456,4 +456,22 @@ public boolean containsQueryWithoutSourceTable() {
}
return aliasToTabs.size()==0 && aliasToSubq.size()==0;
}
+
+ // returns false when the query block doesn't have
+ // a table defined, e.g. "select 5"
+ public boolean hasTableDefined() {
+ // A table is not defined when there only exists a dummy
+ // table in the alias, so if it is blank, we know a table
+ // is defined.
+ if (aliasToTabs.size() == 0) {
Review comment:
Can we check when you were getting `null`? It is suspicious... AFAIK, before
calling this method, we iterate through the same structure in L14102 in
SemanticAnalyzer and alias should not be null (btw, this code could be
integrated within this loop to avoid looping twice).
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