Preserve non-param template helpers

package.json

@@ -1,6 +1,6 @@
 {
   "name": "@tinybirdco/sdk",
-  "version": "0.0.71",
+  "version": "0.0.72",
   "description": "TypeScript SDK for Tinybird Forward - define datasources and pipes as TypeScript",
   "type": "module",
   "main": "./dist/index.js",

src/generator/pipe.test.ts

@@ -185,6 +185,35 @@ describe('Pipe Generator', () => {
       expect(result.content).toContain("{{ Date(start_date, '2025-03-01', required=False) }}");
       expect(result.content).toContain('{{ Int32(page, 0, required=False) }}');
     });
+
+    it('does not inject param metadata into non-param template helper functions', () => {
+      const pipe = definePipe('helper_params_pipe', {
+        params: {
+          siteIds: p
+            .string()
+            .optional()
+            .describe('Comma-separated list of framerSiteId. Only used for test isolation'),
+          groupBy: p.column().optional().describe('Column to group by'),
+        },
+        nodes: [
+          node({
+            name: 'endpoint',
+            sql: 'SELECT {{ column(groupBy) }}, {{ split_to_array(siteIds) }} AS site_ids FROM events',
+          }),
+        ],
+        output: simpleOutput,
+        endpoint: true,
+      });
+
+      const result = generatePipe(pipe);
+
+      expect(result.content).toContain('{{ column(groupBy) }}');
+      expect(result.content).toContain('{{ split_to_array(siteIds) }}');
+      expect(result.content).not.toContain('split_to_array(siteIds,');
+      expect(result.content).not.toContain('column(groupBy,');
+      expect(result.content).not.toContain('required=False');
+      expect(result.content).not.toContain('description=');
+    });
   });
 
   describe('Multiple nodes', () => {

src/generator/pipe.ts

@@ -121,6 +121,31 @@ function hasPositionalDefaultArg(args: string[]): boolean {
   return args.slice(1).some((arg) => !/^[a-zA-Z_][a-zA-Z0-9_]*\s*=/.test(arg.trim()));
 }
 
+const PARAM_METADATA_TEMPLATE_FUNCTIONS = new Set([
+  "String",
+  "UUID",
+  "Int8",
+  "Int16",
+  "Int32",
+  "Int64",
+  "Int128",
+  "Int256",
+  "UInt8",
+  "UInt16",
+  "UInt32",
+  "UInt64",
+  "UInt128",
+  "UInt256",
+  "Float32",
+  "Float64",
+  "Boolean",
+  "Date",
+  "DateTime",
+  "DateTime64",
+  "Array",
+  "JSON",
+]);
+
 function buildParamTemplateArgs(
   args: string[],
   validator: AnyParamValidator
@@ -165,7 +190,13 @@ function applyParamMetadataToSql(
     const expression = String(rawExpression);
     const rewritten = expression.replace(
       /([a-zA-Z_][a-zA-Z0-9_]*)\s*\(([^()]*)\)/g,
-      (call, _functionName, rawArgs) => {
+      (call, functionName, rawArgs) => {
+        if (!PARAM_METADATA_TEMPLATE_FUNCTIONS.has(String(functionName))) {
+          if (String(functionName) !== "column") {
+            return call;
+          }
+        }
+
         const args = splitTopLevelComma(String(rawArgs));
         if (args.length === 0) {
           return call;
@@ -181,6 +212,10 @@ function applyParamMetadataToSql(
           return call;
         }
 
+        if (String(functionName) === "column" && getParamTinybirdType(validator) !== "column") {
+          return call;
+        }
+
         const nextArgs = buildParamTemplateArgs(args, validator);
         if (nextArgs.length === args.length) {
           return call;