jackjlli commented on a change in pull request #3568: Add guava cache to cache
table schema in pinot broker
URL: https://github.com/apache/incubator-pinot/pull/3568#discussion_r254907522
##########
File path:
pinot-broker/src/main/java/com/linkedin/pinot/broker/requesthandler/BaseBrokerRequestHandler.java
##########
@@ -311,6 +329,68 @@ private void validateRequest(BrokerRequest brokerRequest)
{
"Value for 'LIMIT' (" + limit + ") exceeds maximum allowed value
of " + _queryResponseLimit);
}
}
+
+ // Checks whether the query contains non-existence columns.
+ // Table name has already been verified before hitting this line.
+ String tableName = brokerRequest.getQuerySource().getTableName();
+ Schema schema = _tableSchemaCache.getIfTableSchemaPresent(tableName);
+ if (schema != null) {
+ Set<String> allColumns = getAllColumnsFromBrokerRequest(brokerRequest);
+ Set<String> copied = new HashSet<>(allColumns);
+ copied.removeAll(schema.getColumnNames());
+ if (!copied.isEmpty()) {
+ _brokerMetrics.addMeteredTableValue(tableName,
BrokerMeter.QUERY_NON_EXISTENCE_COLUMNS, 1L);
+ throw new RuntimeException("Found non-existence columns from the
query: " + copied.toString());
+ }
+ } else {
+ // If the cache doesn't have the schema, loads the schema to the cache
asynchronously.
+ _tableSchemaCache.refreshTableSchema(tableName);
+ }
+ }
+
+ /**
+ * Helper to get all the columns from broker request.
+ * Returns the set of all the columns.
+ */
+ private Set<String> getAllColumnsFromBrokerRequest(BrokerRequest
brokerRequest) {
+ Set<String> allColumns = new HashSet<>();
+ // Filter
+ FilterQueryTree filterQueryTree =
RequestUtils.generateFilterQueryTree(brokerRequest);
Review comment:
Talked with @mayankshriv offline. It's better we parse the query only once
end-to-end, i.e from broker to server. While this might need to have another
design on changing the payload, which would be out of the scope of this PR. In
the current PR we guarantee the query is parsed only once in pinot-broker. We
can take this payload change in the near future.
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