babelfish-for-postgresql / babelfish_extensions / 11083931505

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Added support for XML EXIST() method (#2913)

Currently we do not support XML EXIST() method. This commit adds the support for XML EXIST() Function.

This support is added by rewriting the query as follows,
xml_expression.EXIST(xpath)   ->   bbf_xmlexist(xpath, xml_expression)

Also, added internal function bbf_xmlexist(xpath, xml_expression) which uses underlying PostgreSQL function
xmlexists() to get the required output.

Task: BABEL-5222
Signed-off-by: Rohit Bhagat <rohitbgt@amazon.com>

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