Add validations

Signed-off-by: Rohit Nayak <rohit@planetscale.com>

go/cmd/vtctldclient/command/vreplication/materialize/create.go

@@ -21,6 +21,9 @@ import (
  "fmt"
  "strings"
 
+ vtrpcpb "vitess.io/vitess/go/vt/proto/vtrpc"
+ "vitess.io/vitess/go/vt/vterrors"
+
  "github.com/spf13/cobra"
 
  "vitess.io/vitess/go/cmd/vtctldclient/cli"
@@ -31,6 +34,8 @@ import (
  vtctldatapb "vitess.io/vitess/go/vt/proto/vtctldata"
 )
 
+const missingCreateParams = "either --table-settings, for a regular Materialize workflow, or, --reference and --tables must be provided, if materializing reference tables"
+
 var (
  createOptions = struct {
  SourceKeyspace string
@@ -77,6 +82,20 @@ should be copied as-is from the source keyspace. Here's an example value for tab
  if err := common.ParseAndValidateCreateOptions(cmd); err != nil {
  return err
  }
+
+ var hasTableSettings, isReference bool
+ if createOptions.TableSettings.val != nil {
+ hasTableSettings = true
+ }
+ if common.CreateOptions.IsReference && len(common.CreateOptions.Tables) > 0 {
+ isReference = true
+ }
+ if !hasTableSettings && !isReference {
+ return vterrors.Errorf(vtrpcpb.Code_FAILED_PRECONDITION, missingCreateParams)
+ }
+ if hasTableSettings && isReference {
+ return vterrors.Errorf(vtrpcpb.Code_FAILED_PRECONDITION, "cannot specify both --table-settings and --reference/--tables")
+ }
  return nil
  },
  RunE: commandCreate,