trinodb/trino

Support `IF NOT EXISTS` clause in `CREATE VIEW` statement.

Open

#28,076 opened on Feb 2, 2026

View on GitHub
 (1 comment) (1 reaction) (0 assignees)Java (2,678 forks)batch import
enhancementgood first issue

Repository metrics

Stars
 (9,113 stars)
PR merge metrics
 (Avg merge 6d 3h) (251 merged PRs in 30d)

Description

IF NOT EXISTS is supported in CREATE MATERIALIZED VIEW, but not for CREATE VIEW

https://github.com/trinodb/trino/blob/6dafeebd711564a42a5e9556dd3803ce652d56d8/core/trino-grammar/src/main/antlr4/io/trino/grammar/sql/SqlBase.g4#L106-L115

there is IMO no reason not to support IF NOT EXISTS in CREATE VIEW as well

cc @martint

Contributor guide

Research direction
Explore the grammar file SqlBase.g4 to add IF NOT EXISTS clause for CREATE VIEW, similar to CREATE MATERIALIZED VIEW. Update parser, analyzer, and add tests.
Tech stack
java
Domain
backenddatabase
Issue type
Feature
DifficultyEstimated implementation difficulty for a new contributor, from 1 for very small changes to 5 for expert-level work.
3
Estimated timeA rough time range for an experienced contributor to investigate, implement, test, and prepare a pull request.
1-3 hours
Activity statusHow available the issue appears right now: fresh, active, stale, blocked, or waiting on maintainer input.
Active
ClarityHow clearly the issue explains the expected change, acceptance criteria, and next step.
Clear
Prerequisites
JavaANTLR
Newbie friendlinessA 1-100 score estimating how approachable this issue is for first-time contributors.
60