Bind inferred ClickHouse numbers with fraction-preserving types

.changeset/eff-342-clickhouse-number-binding.md

@@ -0,0 +1,5 @@
+---
+"@effect/sql-clickhouse": patch
+---
+
+Preserve fractional JavaScript numbers in inferred ClickHouse parameters.

packages/sql/clickhouse/src/ClickhouseClient.ts

@@ -484,7 +484,7 @@ const typeFromUnknown = (value: unknown): string => {
   }
   switch (typeof value) {
     case "number":
-      return "Decimal"
+      return "Float64"
     case "bigint":
       return "Int64"
     case "boolean":

packages/sql/clickhouse/test/Client.test.ts

@@ -1,6 +1,13 @@
-import { describe, it } from "@effect/vitest"
+import { ClickhouseClient } from "@effect/sql-clickhouse"
+import { assert, describe, it } from "@effect/vitest"
+import { Effect } from "effect"
+import * as Statement from "effect/unstable/sql/Statement"
 
 describe("ClickhouseClient", () => {
-  it("should work", () => {
+  it("preserves fractional JavaScript numbers in inferred parameters", () => {
+    const sql = Statement.make(Effect.void as any, ClickhouseClient.makeCompiler(), [], undefined)
+    const [query] = sql`SELECT ${1.5}`.compile()
+
+    assert.strictEqual(query, "SELECT {p1: Float64}")
   })
 })