MB-70924 More plan version clean up

When reading from remote node, the planVersion is of type float64,
not the int expected by current code.

More backport from totoro to properly check the type and obtain
the planVersion.

Change-Id: I58e751b409404b43aa2d465885c4faeecb558bc8
Reviewed-on: https://review.couchbase.org/c/query/+/241726
Tested-by: Sitaram Vemulapalli <sitaram.vemulapalli@couchbase.com>
Well-Formed: Restriction Checker
Reviewed-by: Sitaram Vemulapalli <sitaram.vemulapalli@couchbase.com>

Author: miaobingjie

datastore/system/system_keyspace_prepareds.go

@@ -119,8 +119,19 @@ func (b *preparedsKeyspace) Fetch(keys []string, keysMap map[string]value.Annota
 					m["keyspace"] = b.fullName
 					m["plan"] = doc["plan"]
 					m["txPlans"] = doc["txPlans"]
+					planVersion := int(-1)
 					if planVer, ok := doc["planVersion"]; ok {
-						if planVersion, ok := planVer.(int); ok {
+						switch planVer := planVer.(type) {
+						case int:
+							planVersion = planVer
+						case int64:
+							planVersion = int(planVer)
+						case float64:
+							if value.IsInt(planVer) {
+								planVersion = int(planVer)
+							}
+						}
+						if planVersion >= util.MIN_PLAN_VERSION {
 							m["planVersion"] = int32(planVersion)
 						}
 						remoteValue.UnsetField("planVersion")
@@ -160,6 +171,8 @@ func (b *preparedsKeyspace) Fetch(keys []string, keysMap map[string]value.Annota
 				planVersion := entry.Prepared.PlanVersion()
 				if planVersion >= util.MIN_PLAN_VERSION {
 					m["planVersion"] = int32(planVersion)
+				} else {
+					planVersion = -1
 				}
 
 				// Subquery plans