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The stack is the structure used in calcite to store a relational expression.

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• build() - Pops the most recently created relational expression off the stack. See relational expression creation
• push(rel) -Pushes a relational expression onto the stack. Relational methods such as scan, above, call this method, but user code generally does not
• pushAll(collection) - Pushes a collection of relational expressions onto the stack
• peek() - Returns the relational expression most recently put onto the stack, but does not remove it