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Add README for parser directory
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src/backend/parser/README
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src/backend/parser/README
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This directory does more than tokenize and parse SQL queries. It also
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creates Query structures for the various complex queries that is passed
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to the optimizer and then executor.
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parser.c things start here
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scan.l break query into tokens
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scansup.c handle escapes in input
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keywords.c turn keywords into specific tokens
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gram.y parse the tokens and fill query-type-specific structures
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analyze.c one function for every complex query type like SELECT, INSERT...
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parse_clause.c handle clauses like WHERE, ORDER BY, GROUP BY, ...
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parse_expr.c handle expressions like col, col + 3, x = 3 or x = 4
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parse_oper.c handle operations in expressions
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parse_agg.c handle aggregates, like SUM(col1), AVG(col2), ...
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parse_func.c handle functions like date_part(col3), trim(col4), ...
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parse_node.c create nodes for various structures
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parse_target.c handle the result list of the query
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parse_relation.c support routines for tables and column handling
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parse_type.c support routines for type handling
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