chore: return empty function set from stdlib

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

Author: kyleconroy

internal/engine/clickhouse/stdlib.go

@@ -1,168 +1,9 @@
 package clickhouse
 
 import (
-	"github.com/sqlc-dev/sqlc/internal/sql/ast"
 	"github.com/sqlc-dev/sqlc/internal/sql/catalog"
 )
 
 func defaultSchema(name string) *catalog.Schema {
-	s := &catalog.Schema{Name: name}
-	s.Funcs = []*catalog.Function{
-		// Aggregate functions
-		{
-			Name: "count",
-			Args: []*catalog.Argument{},
-			ReturnType: &ast.TypeName{Name: "UInt64"},
-		},
-		{
-			Name: "sum",
-			Args: []*catalog.Argument{
-				{Type: &ast.TypeName{Name: "any"}},
-			},
-			ReturnType: &ast.TypeName{Name: "any"},
-		},
-		{
-			Name: "avg",
-			Args: []*catalog.Argument{
-				{Type: &ast.TypeName{Name: "any"}},
-			},
-			ReturnType: &ast.TypeName{Name: "Float64"},
-		},
-		{
-			Name: "min",
-			Args: []*catalog.Argument{
-				{Type: &ast.TypeName{Name: "any"}},
-			},
-			ReturnType: &ast.TypeName{Name: "any"},
-		},
-		{
-			Name: "max",
-			Args: []*catalog.Argument{
-				{Type: &ast.TypeName{Name: "any"}},
-			},
-			ReturnType: &ast.TypeName{Name: "any"},
-		},
-		// Type conversion functions
-		{
-			Name: "toInt32",
-			Args: []*catalog.Argument{
-				{Type: &ast.TypeName{Name: "any"}},
-			},
-			ReturnType: &ast.TypeName{Name: "Int32"},
-		},
-		{
-			Name: "toInt64",
-			Args: []*catalog.Argument{
-				{Type: &ast.TypeName{Name: "any"}},
-			},
-			ReturnType: &ast.TypeName{Name: "Int64"},
-		},
-		{
-			Name: "toUInt32",
-			Args: []*catalog.Argument{
-				{Type: &ast.TypeName{Name: "any"}},
-			},
-			ReturnType: &ast.TypeName{Name: "UInt32"},
-		},
-		{
-			Name: "toUInt64",
-			Args: []*catalog.Argument{
-				{Type: &ast.TypeName{Name: "any"}},
-			},
-			ReturnType: &ast.TypeName{Name: "UInt64"},
-		},
-		{
-			Name: "toString",
-			Args: []*catalog.Argument{
-				{Type: &ast.TypeName{Name: "any"}},
-			},
-			ReturnType: &ast.TypeName{Name: "String"},
-		},
-		{
-			Name: "toFloat64",
-			Args: []*catalog.Argument{
-				{Type: &ast.TypeName{Name: "any"}},
-			},
-			ReturnType: &ast.TypeName{Name: "Float64"},
-		},
-		// Date/time functions
-		{
-			Name: "now",
-			Args: []*catalog.Argument{},
-			ReturnType: &ast.TypeName{Name: "DateTime"},
-		},
-		{
-			Name: "today",
-			Args: []*catalog.Argument{},
-			ReturnType: &ast.TypeName{Name: "Date"},
-		},
-		{
-			Name: "toDate",
-			Args: []*catalog.Argument{
-				{Type: &ast.TypeName{Name: "any"}},
-			},
-			ReturnType: &ast.TypeName{Name: "Date"},
-		},
-		{
-			Name: "toDateTime",
-			Args: []*catalog.Argument{
-				{Type: &ast.TypeName{Name: "any"}},
-			},
-			ReturnType: &ast.TypeName{Name: "DateTime"},
-		},
-		// String functions
-		{
-			Name: "concat",
-			Args: []*catalog.Argument{
-				{Type: &ast.TypeName{Name: "String"}},
-				{Type: &ast.TypeName{Name: "String"}},
-			},
-			ReturnType: &ast.TypeName{Name: "String"},
-		},
-		{
-			Name: "lower",
-			Args: []*catalog.Argument{
-				{Type: &ast.TypeName{Name: "String"}},
-			},
-			ReturnType: &ast.TypeName{Name: "String"},
-		},
-		{
-			Name: "upper",
-			Args: []*catalog.Argument{
-				{Type: &ast.TypeName{Name: "String"}},
-			},
-			ReturnType: &ast.TypeName{Name: "String"},
-		},
-		{
-			Name: "length",
-			Args: []*catalog.Argument{
-				{Type: &ast.TypeName{Name: "String"}},
-			},
-			ReturnType: &ast.TypeName{Name: "UInt64"},
-		},
-		// Conditional functions
-		{
-			Name: "if",
-			Args: []*catalog.Argument{
-				{Type: &ast.TypeName{Name: "UInt8"}},
-				{Type: &ast.TypeName{Name: "any"}},
-				{Type: &ast.TypeName{Name: "any"}},
-			},
-			ReturnType: &ast.TypeName{Name: "any"},
-		},
-		// Array functions
-		{
-			Name: "array",
-			Args: []*catalog.Argument{},
-			ReturnType: &ast.TypeName{Name: "Array"},
-		},
-		{
-			Name: "arrayJoin",
-			Args: []*catalog.Argument{
-				{Type: &ast.TypeName{Name: "Array"}},
-			},
-			ReturnType: &ast.TypeName{Name: "any"},
-		},
-	}
-	return s
+	return &catalog.Schema{Name: name}
 }