fix(query): Properly handle format outcome (#893)

Signed-off-by: Nico Wagner <[email protected]>

crates/pica-cli/tests/select/mod.rs

@@ -793,6 +793,22 @@ fn select_query_format() -> TestResult {
         ))
         .stderr(predicates::str::is_empty());
 
+    let mut cmd = Command::cargo_bin("pica")?;
+    let assert = cmd
+        .arg("select")
+        .arg("[email protected],028R{a <$> (', ' d <*> ' (' v ')') | v in ['Vater', 'Mutter']}")
+        .arg(data_dir().join("ada.dat"))
+        .assert();
+
+    assert
+        .success()
+        .code(0)
+        .stdout(predicates::ord::eq(
+            "119232022,\"Byron, George Gordon Byron (Vater)\"\n\
+            119232022,\"Byron, Anne Isabella Milbanke Byron (Mutter)\"\n"
+        ))
+        .stderr(predicates::str::is_empty());
+
     Ok(())
 }
 

src/query.rs

@@ -124,9 +124,12 @@ impl Fragment {
         match self {
             Literal(lit) => Outcome(vec![vec![lit.clone()]]),
             #[cfg(feature = "unstable")]
-            Format(fmt) => Outcome(vec![record
-                .format(fmt, &options.into())
-                .collect()]),
+            Format(fmt) => Outcome(
+                record
+                    .format(fmt, &options.into())
+                    .map(|e| vec![e])
+                    .collect::<Vec<Vec<_>>>(),
+            ),
             Path(path) => {
                 let fields = record
                     .fields()