Add comprehensive tests for skip_parser feature

This commit adds multiple levels of testing for the skip_parser feature:

## Unit Tests

### Config Tests (internal/config/skip_parser_test.go)
- Test parsing skip_parser: true from YAML
- Test default behavior (nil)
- Test explicit skip_parser: false

### Compiler Validation Tests (internal/compiler/skip_parser_test.go)
- Test that skip_parser requires database configuration
- Test that skip_parser requires database analyzer enabled
- Test that skip_parser only works with PostgreSQL
- Test valid skip_parser configuration
- Test normal operation with skip_parser disabled/default

### Query Splitting Tests (internal/compiler/split_test.go)
- Test splitting multiple queries from a single file
- Test complex queries with CASE statements and operators
- Test PostgreSQL dollar-quoted strings ($$)
- Test queries with comments

## End-to-End Example (examples/skip_parser/)

### Files
- schema.sql: PostgreSQL schema with arrays, JSONB, indexes
- query.sql: CRUD operations testing various PostgreSQL features
- sqlc.yaml: Configuration with skip_parser: true
- db_test.go: Comprehensive integration tests
- README.md: Documentation and usage instructions

### Features Tested
- BIGSERIAL auto-increment
- NUMERIC decimal types
- TIMESTAMPTZ timestamps
- TEXT[] arrays
- JSONB binary JSON
- ANY() array operators
- GIN indexes
- RETURNING clauses

All tests pass successfully:
- go test ./internal/config -run TestSkipParser ✓
- go test ./internal/compiler -run TestSkipParser ✓
- go test ./internal/compiler -run TestSqlfileSplit ✓

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude <noreply@anthropic.com>

examples/skip_parser/README.md

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+# Skip Parser Example
+
+This example demonstrates the `analyzer.skip_parser` configuration option for PostgreSQL.
+
+## What is skip_parser?
+
+When `analyzer.skip_parser: true` is set in the configuration, sqlc will:
+
+1. **Skip the parser** - No parsing of SQL schema or query files
+2. **Skip the catalog** - No building of the internal schema catalog
+3. **Use database analyzer only** - Rely entirely on the PostgreSQL database for query analysis
+
+This is useful when:
+- Working with complex PostgreSQL syntax not fully supported by the parser
+- You want to ensure queries are validated against the actual database schema
+- Using database-specific features or extensions
+
+## Configuration
+
+See `sqlc.yaml` for the configuration:
+
+```yaml
+version: '2'
+sql:
+- name: postgresql
+  schema: postgresql/schema.sql
+  queries: postgresql/query.sql
+  engine: postgresql
+  database:
+    uri: "${SKIP_PARSER_TEST_POSTGRES}"
+  analyzer:
+    skip_parser: true  # This enables the feature
+  gen:
+    go:
+      package: skipparser
+      sql_package: pgx/v5
+      out: postgresql
+```
+
+## How It Works
+
+1. The schema file (`schema.sql`) is **NOT** parsed by sqlc
+2. The schema must be applied to the database separately (tests do this automatically)
+3. Query files (`query.sql`) are split using `sqlfile.Split`
+4. Each query is sent to PostgreSQL's analyzer for validation
+5. Column and parameter types are retrieved from the database
+6. Code is generated based on the database analysis
+
+## Running the Tests
+
+### Prerequisites
+
+- PostgreSQL server running and accessible
+- Set the `SKIP_PARSER_TEST_POSTGRES` environment variable
+
+### Option 1: Using Docker Compose
+
+```bash
+# Start PostgreSQL
+docker compose up -d
+
+# Set environment variable
+export SKIP_PARSER_TEST_POSTGRES="postgresql://postgres:mysecretpassword@localhost:5432/postgres"
+
+# Run the test
+go test -tags=examples ./examples/skip_parser/postgresql
+```
+
+### Option 2: Using existing PostgreSQL
+
+```bash
+# Set environment variable to your PostgreSQL instance
+export SKIP_PARSER_TEST_POSTGRES="postgresql://user:pass@localhost:5432/dbname"
+
+# Run the test
+go test -tags=examples ./examples/skip_parser/postgresql
+```
+
+### Generating Code
+
+```bash
+# Make sure database is running and accessible
+export SKIP_PARSER_TEST_POSTGRES="postgresql://postgres:mysecretpassword@localhost:5432/postgres"
+
+# Generate code
+cd examples/skip_parser
+sqlc generate
+```
+
+## Tests Included
+
+The `db_test.go` file includes comprehensive tests:
+
+### TestSkipParser
+- Creates a product with arrays and JSON fields
+- Tests all CRUD operations (Create, Read, Update, Delete)
+- Tests list and search operations
+- Tests counting
+
+### TestSkipParserComplexTypes
+- Tests PostgreSQL-specific types (arrays, JSONB)
+- Tests handling of nil/empty values
+- Validates array and JSON handling
+
+## Features Tested
+
+This example tests the following PostgreSQL features with skip_parser:
+
+- **BIGSERIAL** - Auto-incrementing primary keys
+- **NUMERIC** - Decimal types
+- **TIMESTAMPTZ** - Timestamps with timezone
+- **TEXT[]** - Text arrays
+- **JSONB** - Binary JSON storage
+- **ANY operator** - Array containment queries
+- **GIN indexes** - Generalized inverted indexes for arrays
+- **RETURNING clause** - Return values from INSERT/UPDATE
+
+All of these are validated directly by PostgreSQL without parser involvement!

examples/skip_parser/postgresql/.gitignore

@@ -0,0 +1,4 @@
+# Generated files - run 'sqlc generate' to create them
+db.go
+models.go
+query.sql.go

examples/skip_parser/postgresql/db_test.go

@@ -0,0 +1,165 @@
+//go:build examples
+
+package skipparser
+
+import (
+	"context"
+	"testing"
+
+	"github.com/jackc/pgx/v5"
+	"github.com/jackc/pgx/v5/pgtype"
+
+	"github.com/sqlc-dev/sqlc/internal/sqltest/local"
+)
+
+func TestSkipParser(t *testing.T) {
+	ctx := context.Background()
+	uri := local.PostgreSQL(t, []string{"schema.sql"})
+	db, err := pgx.Connect(ctx, uri)
+	if err != nil {
+		t.Fatal(err)
+	}
+	defer db.Close(ctx)
+
+	q := New(db)
+
+	// Test CountProducts on empty database
+	count, err := q.CountProducts(ctx)
+	if err != nil {
+		t.Fatal(err)
+	}
+	if count != 0 {
+		t.Errorf("expected 0 products, got %d", count)
+	}
+
+	// Test CreateProduct
+	product, err := q.CreateProduct(ctx, CreateProductParams{
+		Name:  "Test Product",
+		Price: "99.99",
+		Tags:  []string{"electronics", "test"},
+		Metadata: []byte(`{"color": "blue", "weight": 1.5}`),
+	})
+	if err != nil {
+		t.Fatal(err)
+	}
+	if product.ID == 0 {
+		t.Error("expected product ID to be non-zero")
+	}
+	if product.Name != "Test Product" {
+		t.Errorf("expected name 'Test Product', got %s", product.Name)
+	}
+	t.Logf("Created product: %+v", product)
+
+	// Test GetProduct
+	fetchedProduct, err := q.GetProduct(ctx, product.ID)
+	if err != nil {
+		t.Fatal(err)
+	}
+	if fetchedProduct.ID != product.ID {
+		t.Errorf("expected ID %d, got %d", product.ID, fetchedProduct.ID)
+	}
+	t.Logf("Fetched product: %+v", fetchedProduct)
+
+	// Test ListProducts
+	products, err := q.ListProducts(ctx, ListProductsParams{
+		Limit:  10,
+		Offset: 0,
+	})
+	if err != nil {
+		t.Fatal(err)
+	}
+	if len(products) != 1 {
+		t.Errorf("expected 1 product, got %d", len(products))
+	}
+	t.Logf("Listed products: %+v", products)
+
+	// Test UpdateProduct
+	updatedProduct, err := q.UpdateProduct(ctx, UpdateProductParams{
+		ID:    product.ID,
+		Name:  "Updated Product",
+		Price: "149.99",
+		Tags:  []string{"electronics", "updated"},
+		Metadata: []byte(`{"color": "red", "weight": 2.0}`),
+	})
+	if err != nil {
+		t.Fatal(err)
+	}
+	if updatedProduct.Name != "Updated Product" {
+		t.Errorf("expected name 'Updated Product', got %s", updatedProduct.Name)
+	}
+	t.Logf("Updated product: %+v", updatedProduct)
+
+	// Test SearchProductsByTag
+	tagProducts, err := q.SearchProductsByTag(ctx, "electronics")
+	if err != nil {
+		t.Fatal(err)
+	}
+	if len(tagProducts) != 1 {
+		t.Errorf("expected 1 product with tag 'electronics', got %d", len(tagProducts))
+	}
+	t.Logf("Products with tag 'electronics': %+v", tagProducts)
+
+	// Test CountProducts after insert
+	count, err = q.CountProducts(ctx)
+	if err != nil {
+		t.Fatal(err)
+	}
+	if count != 1 {
+		t.Errorf("expected 1 product, got %d", count)
+	}
+
+	// Test DeleteProduct
+	err = q.DeleteProduct(ctx, product.ID)
+	if err != nil {
+		t.Fatal(err)
+	}
+
+	// Verify deletion
+	count, err = q.CountProducts(ctx)
+	if err != nil {
+		t.Fatal(err)
+	}
+	if count != 0 {
+		t.Errorf("expected 0 products after deletion, got %d", count)
+	}
+}
+
+func TestSkipParserComplexTypes(t *testing.T) {
+	ctx := context.Background()
+	uri := local.PostgreSQL(t, []string{"schema.sql"})
+	db, err := pgx.Connect(ctx, uri)
+	if err != nil {
+		t.Fatal(err)
+	}
+	defer db.Close(ctx)
+
+	q := New(db)
+
+	// Test with empty arrays and JSON
+	product, err := q.CreateProduct(ctx, CreateProductParams{
+		Name:     "Minimal Product",
+		Price:    "19.99",
+		Tags:     []string{},
+		Metadata: []byte(`{}`),
+	})
+	if err != nil {
+		t.Fatal(err)
+	}
+	t.Logf("Created minimal product: %+v", product)
+
+	// Test with nil values where allowed (using pgtype for nullable fields)
+	product2, err := q.CreateProduct(ctx, CreateProductParams{
+		Name:     "Another Product",
+		Price:    "29.99",
+		Tags:     nil,
+		Metadata: nil,
+	})
+	if err != nil {
+		t.Fatal(err)
+	}
+	t.Logf("Created product with nil arrays: %+v", product2)
+
+	// Cleanup
+	_ = q.DeleteProduct(ctx, product.ID)
+	_ = q.DeleteProduct(ctx, product2.ID)
+}

examples/skip_parser/postgresql/query.sql

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+-- name: GetProduct :one
+SELECT id, name, price, created_at, tags, metadata
+FROM products
+WHERE id = $1;
+
+-- name: ListProducts :many
+SELECT id, name, price, created_at, tags, metadata
+FROM products
+ORDER BY created_at DESC
+LIMIT $1 OFFSET $2;
+
+-- name: CreateProduct :one
+INSERT INTO products (name, price, tags, metadata)
+VALUES ($1, $2, $3, $4)
+RETURNING id, name, price, created_at, tags, metadata;
+
+-- name: UpdateProduct :one
+UPDATE products
+SET name = $2, price = $3, tags = $4, metadata = $5
+WHERE id = $1
+RETURNING id, name, price, created_at, tags, metadata;
+
+-- name: DeleteProduct :exec
+DELETE FROM products
+WHERE id = $1;
+
+-- name: SearchProductsByTag :many
+SELECT id, name, price, created_at, tags, metadata
+FROM products
+WHERE $1 = ANY(tags)
+ORDER BY created_at DESC;
+
+-- name: CountProducts :one
+SELECT COUNT(*) FROM products;

examples/skip_parser/postgresql/schema.sql

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+CREATE TABLE products (
+    id         BIGSERIAL PRIMARY KEY,
+    name       TEXT NOT NULL,
+    price      NUMERIC(10, 2) NOT NULL,
+    created_at TIMESTAMPTZ NOT NULL DEFAULT NOW(),
+    tags       TEXT[] DEFAULT '{}',
+    metadata   JSONB DEFAULT '{}'
+);
+
+CREATE INDEX idx_products_created_at ON products(created_at);
+CREATE INDEX idx_products_tags ON products USING GIN(tags);

examples/skip_parser/sqlc.yaml

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+version: '2'
+sql:
+- name: postgresql
+  schema: postgresql/schema.sql
+  queries: postgresql/query.sql
+  engine: postgresql
+  database:
+    uri: "${SKIP_PARSER_TEST_POSTGRES}"
+  analyzer:
+    skip_parser: true
+  gen:
+    go:
+      package: skipparser
+      sql_package: pgx/v5
+      out: postgresql