spanner: parser should allow JSON_VALUE_ARRAY columns

[wwidner-ch]

Client

spanner

Environment

e.g. Alpine Docker on GKE

Go Environment

$ go version
go version go1.21.5 darwin/arm64

$ go env
GO111MODULE=''
GOARCH='arm64'
GOBIN=''
GOCACHE='/Users/weswidner/Library/Caches/go-build'
GOENV='/Users/weswidner/Library/Application Support/go/env'
GOEXE=''
GOEXPERIMENT=''
GOFLAGS=''
GOHOSTARCH='arm64'
GOHOSTOS='darwin'
GOINSECURE=''
GOMODCACHE='/Users/weswidner/go/pkg/mod'
GONOPROXY=''
GONOSUMDB=''
GOOS='darwin'
GOPATH='/Users/weswidner/go'
GOPRIVATE=''
GOPROXY='https://proxy.golang.org,direct'
GOROOT='/opt/homebrew/Cellar/go/1.21.5/libexec'
GOSUMDB='sum.golang.org'
GOTMPDIR=''
GOTOOLCHAIN='auto'
GOTOOLDIR='/opt/homebrew/Cellar/go/1.21.5/libexec/pkg/tool/darwin_arm64'
GOVCS=''
GOVERSION='go1.21.5'
GCCGO='gccgo'
AR='ar'
CC='cc'
CXX='c++'
CGO_ENABLED='1'
GOMOD='/Users/weswidner/code/deproot/src/github.com/CyberhavenInc/dataflow/backend/go.mod'
GOWORK=''
CGO_CFLAGS='-O2 -g'
CGO_CPPFLAGS=''
CGO_CXXFLAGS='-O2 -g'
CGO_FFLAGS='-O2 -g'
CGO_LDFLAGS='-O2 -g'
PKG_CONFIG='pkg-config'
GOGCCFLAGS='-fPIC -arch arm64 -pthread -fno-caret-diagnostics -Qunused-arguments -fmessage-length=0 -ffile-prefix-map=/var/folders/yp/hj3tmk457zz3mt4pby42vmgm0000gn/T/go-build3120587149=/tmp/go-build -gno-record-gcc-switches -fno-common'

Code

e.g.

package main

import (
	"cloud.google.com/go/spanner/spansql"
)

func main() {
	_, err := spansql.ParseDDL("testfile.sql", `ALTER TABLE testtable ADD COLUMN IF NOT EXISTS testcolumn ARRAY<STRING(MAX)> AS (JSON_VALUE_ARRAY(edge, "$.some.json.path")) STORED;`)
	if err != nil {
		panic(err)
	}
}

Expected behavior

Statement with JSON_VALUE_ARRAY should parse without error

Actual behavior

panic: testfile.sql:1.97: got "(" while expecting ")"

Additional context

The funcNames slice in keywords.go needs to be extended to include the JSON extractors listed here.