dvjyothsna commented on a change in pull request #1666: DRILL-7058: Refresh
command to support subset of columns
URL: https://github.com/apache/drill/pull/1666#discussion_r261733762
##########
File path:
exec/java-exec/src/main/java/org/apache/drill/exec/planner/sql/handlers/RefreshMetadataHandler.java
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@@ -130,5 +140,25 @@ public PhysicalPlan getPlan(SqlNode sqlNode) throws
ForemanSetupException {
}
}
+ private Set<String> getColumnRootSegments(SqlNodeList columnList) {
+ Set<String> columnSet = new HashSet<>();
+ if (columnList != null) {
+ for (SqlNode column : columnList.getList()) {
+ // Add only the root segment. Collect metadata for all the columns
under that root segment
+
columnSet.add(SchemaPath.parseFromString(column.toString()).getRootSegmentPath());
+ }
+ }
+ return columnSet;
+ }
+
+ /* Generates the column list specified in the Refresh statement */
+ private SqlNodeList getColumnList(final SqlRefreshMetadata
sqlrefreshMetadata) {
+ SqlNodeList columnList = sqlrefreshMetadata.getFieldList();
+ if (columnList == null || columnList.size() <= 0) {
Review comment:
I don't think isEmpty() method exists for SqlNodeList class.
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