fix(compiler): Account for parameters without parents

internal/compiler/resolve.go

@@ -600,6 +600,16 @@ func (comp *Compiler) resolveCatalogRefs(qc *QueryCatalog, rvs []*ast.RangeVar,
 
 		default:
 			slog.Debug("unsupported reference type", "type", fmt.Sprintf("%T", n))
+			defaultP := named.NewInferredParam(ref.name, false)
+			p, isNamed := params.FetchMerge(ref.ref.Number, defaultP)
+			a = append(a, Parameter{
+				Number: ref.ref.Number,
+				Column: &Column{
+					Name:         p.Name(),
+					DataType:     "any",
+					IsNamedParam: isNamed,
+				},
+			})
 		}
 	}
 	return a, nil

internal/endtoend/testdata/coalesce_params/issue.md

@@ -0,0 +1,2 @@
+https://github.com/sqlc-dev/sqlc/issues/2748
+https://github.com/sqlc-dev/sqlc/issues/2786

internal/endtoend/testdata/coalesce_params/mysql/query.sql

@@ -0,0 +1,17 @@
+-- name: AddEvent :execlastid
+INSERT INTO `Event` (
+    Timezone
+) VALUES (
+    (CASE WHEN sqlc.arg("Timezone") = "calendar" THEN (SELECT cal.Timezone FROM Calendar cal WHERE cal.IdKey = sqlc.arg("calendarIdKey")) ELSE sqlc.arg("Timezone") END)
+);
+
+-- name: AddAuthor :execlastid
+INSERT INTO authors (
+    address,
+    name,
+    bio
+) VALUES (
+    ?,
+    COALESCE(sqlc.narg("calName"), ""),
+    COALESCE(sqlc.narg("calDescription"), "")
+);

internal/endtoend/testdata/coalesce_params/mysql/schema.sql

@@ -0,0 +1,43 @@
+CREATE TABLE `Calendar` (
+  `Id` bigint(20) unsigned NOT NULL AUTO_INCREMENT,
+  `Relation` bigint(20) unsigned NOT NULL,
+  `CalendarName` longblob NOT NULL,
+  `Title` longblob NOT NULL,
+  `Description` longblob NOT NULL,
+  `Timezone` varchar(50) NOT NULL,
+  `UniqueKey` varchar(50) NOT NULL,
+  `IdKey` varchar(50) NOT NULL,
+  `MainCalendar` enum('true','false') NOT NULL DEFAULT 'false',
+  `CreateDate` datetime NOT NULL DEFAULT CURRENT_TIMESTAMP,
+  `ModifyDate` datetime NOT NULL DEFAULT CURRENT_TIMESTAMP ON UPDATE CURRENT_TIMESTAMP,
+  PRIMARY KEY (`Id`),
+  KEY `Relation` (`Relation`),
+  KEY `UniqueKey` (`UniqueKey`),
+  KEY `IdKey` (`IdKey`)
+) ENGINE=InnoDB AUTO_INCREMENT=2 DEFAULT CHARSET=utf8mb4;
+
+
+CREATE TABLE `Event` (
+  `Id` bigint(20) unsigned NOT NULL AUTO_INCREMENT,
+  `Relation` bigint(20) unsigned NOT NULL,
+  `CalendarReference` bigint(20) unsigned NOT NULL,
+  `UniqueKey` varchar(50) NOT NULL,
+  `EventName` longblob NOT NULL,
+  `Description` longblob NOT NULL,
+  `Location` varchar(500) NOT NULL,
+  `Timezone` varchar(50) NOT NULL,
+  `IdKey` varchar(48) DEFAULT NULL,
+  PRIMARY KEY (`Id`),
+  KEY `Relation` (`Relation`),
+  KEY `CalendarReference` (`CalendarReference`),
+  KEY `UniqueKey` (`UniqueKey`),
+  KEY `IdKey` (`IdKey`)
+) ENGINE=InnoDB AUTO_INCREMENT=5 DEFAULT CHARSET=utf8mb4;
+
+
+CREATE TABLE authors (
+  id   BIGINT AUTO_INCREMENT NOT NULL,
+  address VARCHAR(200) NOT NULL,
+  name VARCHAR(20) NOT NULL,
+  bio  LONGTEXT NOT NULL
+);

internal/endtoend/testdata/coalesce_params/mysql/sqlc.yaml

@@ -0,0 +1,9 @@
+version: "2"
+sql:
+  - engine: "mysql"
+    schema: "schema.sql"
+    queries: "query.sql"
+    gen:
+      go:
+        package: "querytest"
+        out: "go"