rewrite ExpressionAnalyzer.collectUsedColumns CLICKHOUSE-3996 #3930
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Short description (up to few sentences):
Better way to collect columns, tables and joins from AST when checking required columns.
Detailed description (optional):
RequiredSourceColumnsVisitor form ColumnNamesContext from AST (without knowledge about sources). ExpressionAnalyzer uses ColumnNamesContext to filter unneeded columns.