Add better ConnectorError handling in case the advisory lock fails to be parsed to a boolean

Author: onnovos

schema-engine/connectors/sql-schema-connector/src/flavour/postgres.rs

@@ -388,7 +388,13 @@ const MIGRATE_ADVISORY_LOCK_ID: i64 = 72707369;
             let acquired = result
                 .first()
                 .and_then(|row| row.at(0).and_then(|v| v.as_bool()))
-                .unwrap_or(false);
+                .ok_or_else(|| {
+                    ConnectorError::from_msg(
+                        "Unexpected result from pg_try_advisory_lock(72707369): \
+                         expected a single boolean column."
+                            .to_owned(),
+                    )
+                })?;
 
             if !acquired {
                 return Err(ConnectorError::from_msg(format!(