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source.py

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# Interface for the data source used in queries.

# Currently only includes query capabilities.

class Source:

def __init__(self):

None

def isQueryable(self):

return False

# Check if the source will support the execution of an expression,

# given that clauses have already been pushed into it.

def supports(self,clauses,expr,visible_vars):

return False

# Database source for all relational database sources. Currently there is

# no common functionality across different RDBMS sources

class RDBMSTable(Source):

def isQueryable(self):

return True