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David Mollitor commented on HIVE-23177: --------------------------------------- HIVE-15577 documents some of the limitations of ANTLR3 that Hive is starting to come up against. > Upgrade to ANTLR4 > ----------------- > > Key: HIVE-23177 > URL: https://issues.apache.org/jira/browse/HIVE-23177 > Project: Hive > Issue Type: Improvement > Reporter: David Mollitor > Priority: Major > > Upgrade Hive to ANTL4, ANTLR3 lost support many moons ago. > This is going to be a big lift. Many of the Hive rules use the "rule > rewrite" feature which no longer exists in ANLTR4 and it must be completely > re-implemented: > https://stackoverflow.com/questions/14565794/antlr-4-tree-inject-rewrite-operator -- This message was sent by Atlassian Jira (v8.3.4#803005)