Format the full range of PostgreSQL interval literals

Author: nene

src/syntax/expr.ts

@@ -172,7 +172,8 @@ export const exprMap: CstToDocMap<AllExprNodes> = {
   extract_expr: (print) => print(["extractKw", "args"]),
   extract_from: (print) => print.spaced(["unit", "fromKw", "expr"]),
   week_expr: (print) => print(["weekKw", "args"]),
-  interval_literal: (print) => print.spaced(["intervalKw", "value", "unit"]),
+  interval_literal: (print) =>
+    print.spaced(["intervalKw", "precision", "value", "unit"]),
   array_literal_expr: (print) => print(["arrayKw", "expr"]),
   array_expr: (print) =>
     group(["[", indent([softline, print("expr")]), softline, "]"]),

test/expr/literal.test.ts

@@ -10,10 +10,6 @@ describe("literal", () => {
     await testBigquery(`SELECT NUMERIC '12345', BIGNUMERIC '1.23456e05'`);
   });
 
-  it(`formats PostgreSQL INTERVAL literals`, async () => {
-    await testPostgresql(`SELECT INTERVAL '1 day'`);
-  });
-
   it(`formats DATE/TIME literals`, async () => {
     await testBigquery(
       dedent`
@@ -45,6 +41,19 @@ describe("literal", () => {
     );
   });
 
+  it(`formats PostgreSQL INTERVAL literals`, async () => {
+    await testPostgresql(
+      dedent`
+        SELECT
+          INTERVAL '1 day',
+          INTERVAL (3) '25 second',
+          INTERVAL '25' SECOND (15),
+          INTERVAL '30:25' MINUTE TO SECOND (15),
+          INTERVAL '30:25' MINUTE TO SECOND
+      `,
+    );
+  });
+
   describe("array literals", () => {
     it(`formats BigQuery array literals`, async () => {
       await testBigquery(