Added line and column operators

pkg/yqlib/operator_column.go

@@ -0,0 +1,23 @@
+package yqlib
+
+import (
+	"container/list"
+	"fmt"
+
+	yaml "gopkg.in/yaml.v3"
+)
+
+func columnOperator(d *dataTreeNavigator, context Context, expressionNode *ExpressionNode) (Context, error) {
+	log.Debugf("columnOperator")
+
+	var results = list.New()
+
+	for el := context.MatchingNodes.Front(); el != nil; el = el.Next() {
+		candidate := el.Value.(*CandidateNode)
+		node := &yaml.Node{Kind: yaml.ScalarNode, Value: fmt.Sprintf("%v", candidate.Node.Column), Tag: "!!int"}
+		result := candidate.CreateReplacement(node)
+		results.PushBack(result)
+	}
+
+	return context.ChildContext(results), nil
+}