From 5c1851be150fe549629222e331a83f95322464a3 Mon Sep 17 00:00:00 2001
From: Steve McCanne <steve@mccanne.com>
Date: Sun, 17 Nov 2024 10:17:09 -0800
Subject: [PATCH] add SQL LENGTH() function as alias for len() (#5486)

---
 runtime/sam/expr/function/function.go    | 2 +-
 runtime/vam/expr/function/function.go    | 2 +-
 runtime/ztests/expr/function/length.yaml | 9 +++++++++
 3 files changed, 11 insertions(+), 2 deletions(-)
 create mode 100644 runtime/ztests/expr/function/length.yaml

diff --git a/runtime/sam/expr/function/function.go b/runtime/sam/expr/function/function.go
index cf8bf61f66..57077a2596 100644
--- a/runtime/sam/expr/function/function.go
+++ b/runtime/sam/expr/function/function.go
@@ -34,7 +34,7 @@ func New(zctx *super.Context, name string, narg int) (expr.Function, field.Path,
 	case "grok":
 		argmin, argmax = 2, 3
 		f = newGrok(zctx)
-	case "len":
+	case "len", "length":
 		f = &LenFn{zctx: zctx}
 	case "abs":
 		f = &Abs{zctx: zctx}
diff --git a/runtime/vam/expr/function/function.go b/runtime/vam/expr/function/function.go
index b9320abb27..9a4e82eccd 100644
--- a/runtime/vam/expr/function/function.go
+++ b/runtime/vam/expr/function/function.go
@@ -37,7 +37,7 @@ func New(zctx *super.Context, name string, narg int) (expr.Function, field.Path,
 		f = &Join{zctx: zctx}
 	case "kind":
 		f = &Kind{zctx: zctx}
-	case "len":
+	case "len", "length":
 		f = &Len{zctx}
 	case "levenshtein":
 		argmin, argmax = 2, 2
diff --git a/runtime/ztests/expr/function/length.yaml b/runtime/ztests/expr/function/length.yaml
new file mode 100644
index 0000000000..959dda56ec
--- /dev/null
+++ b/runtime/ztests/expr/function/length.yaml
@@ -0,0 +1,9 @@
+zed: SELECT LENGTH('W3Schools.com');
+
+vector: true
+
+input: |
+  null
+
+output: |
+  {length:13}