On 01/05/2015 09:28 PM, Ravi Kiran wrote:

I am going through the hashjoin algorithm in postgres. I find a function
ExecHashjoin , which is called each time a new tuple is required by the
hash join *Node.*

could someone explain what exactly node mean in  postgres.

See src/backend/nodes/. It's a mechanism that imitates class inheritance in object-oriented languages. Node is the superclass that everything else inherits from. Every Node type supports some basic operations like copy, equals and serialization to/from text.

- Heikki

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