36 lines
1.6 KiB
Plaintext
36 lines
1.6 KiB
Plaintext
src/backend/parser/README
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Parser
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======
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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 are 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 strings
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gram.y parse the tokens and produce a "raw" parse tree
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analyze.c top level of parse analysis for optimizable queries
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parse_agg.c handle aggregates, like SUM(col1), AVG(col2), ...
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parse_clause.c handle clauses like WHERE, ORDER BY, GROUP BY, ...
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parse_coerce.c handle coercing expressions to different data types
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parse_collate.c assign collation information in completed expressions
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parse_cte.c handle Common Table Expressions (WITH clauses)
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parse_expr.c handle expressions like col, col + 3, x = 3 or x = 4
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parse_enr.c handle ephemeral named rels (trigger transition tables, ...)
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parse_func.c handle functions, table.column and column identifiers
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parse_jsontable.c handle JSON_TABLE
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parse_merge.c handle MERGE
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parse_node.c create nodes for various structures
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parse_oper.c handle operators in expressions
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parse_param.c handle Params (for the cases used in the core backend)
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parse_relation.c support routines for tables and column handling
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parse_target.c handle the result list of the query
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parse_type.c support routines for data type handling
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parse_utilcmd.c parse analysis for utility commands (done at execution time)
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See also src/common/keywords.c, which contains the table of standard
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keywords and the keyword lookup function. We separated that out because
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various frontend code wants to use it too.
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