Allow for if() function in SQLite

The IF keyword won't be allowed in CREATE TABLE because it will
naturally conflict with CREATE TABLE IF NOT EXISTS.

Author: nene

src/keywords/sqlite.keywords.ts

@@ -79,7 +79,7 @@ export const keywordDefs: Record<string, string[]> = {
   GROUP: ["create-table", "col-alias", "tbl-alias", "col-name"],
   GROUPS: ["parser-issue"], // Should be allowed as alias name, but currently causes parsing issues.
   HAVING: ["create-table", "col-alias", "tbl-alias", "col-name"],
-  IF: ["create-table"],
+  IF: [],
   IGNORE: [],
   IMMEDIATE: [],
   IN: ["create-table", "col-alias", "tbl-alias", "col-name"],

test/expr/builtin_functions.test.ts

@@ -21,6 +21,7 @@ describe("builtin functions", () => {
       "glob",
       "hex",
       "ifnull",
+      "if",
       "iif",
       "instr",
       "last_insert_rowid",