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1.Update antlr parser to recognize this pattern
2.Implement required (native) query
3.Add db-container Integration tests for
a.filter on string leaf-value
b.filter on Integer leaf-value
c.filter on leaf-list value
4.Update documentation
5.demo to team
Limitations
1. contains condition is case sensitive.
2. Only leaves can be used, leaf-list are not supported.
3. Only string and integer values are supported, boolean and float values are not supported.
4. When empty value is passed with contains it returns all the nodes that has given leaf element.