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def children(self, level, metadata, table):
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col = common.col_get(sqlalchemy.Table(level.object.table_name,metadata), level.object.column_name)
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col_id = common.col_get(sqlalchemy.Table(level.object.table_name,metadata), level.object.column_name)
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qexpr = sqlalchemy.literal('Q')+ sqlalchemy.sql.cast(sqlalchemy.func.date_part('QUARTER',col_id), sqlalchemy.types.String) + sqlalchemy.sql.cast(sqlalchemy.func.date_part('month',col_id),sqlalchemy.types.String)
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'column_name':[sqlalchemy.func.date_part('month',col)],
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'axis_mapping': [axis_map.column_mapping]