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The symbol table for all of the keywords and tokens supported by the parser Type definitions for the symbol table Mapping of symbols to functions used in the parser Definition of LEX structure Definition of Lex class The Lex/YACC parser code Contains the majority of the query routing and parsing functions except for the lexical parser

> open System.IO;; > File.WriteAllLines("test.txt", [| "This is a test file."; "It is easy to read." |]);; val it : unit = () Many simple file-processing tasks require reading all the lines of a file. You can do this by reading all the lines in one action as an array using System.IO.File.ReadAllLines: > open System.IO;; > File.ReadAllLines("test.txt");; val it : string [] = [| "This is a test file.";

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Aggregate operators are a powerful way of working with seq<type> values. However, F# also provides a convenient and compact syntax called sequence expressions for specifying sequence values that can be built using operations such as choose, map, filter, and concat. You can also use sequence expressions to specify the shapes of lists and arrays. It s valuable to learn how to use sequence expressions: They re a compact way of specifying interesting data and generative processes. They re used to specify database queries when using data-access layers such as Microsoft s Language Integrated Queries (LINQ). See 15 for examples of using sequence expressions this way. They re one particular use of computation expressions, a more general concept that has several uses in F# programming. 9 discusses computation expressions, and we show how to use them for asynchronous and parallel programming in 13.

Although the boundary of where the parser ends and the optimizer begins is not clear from the MySQL documentation (there are contradictions), it is clear from the definition of the optimizer that the routing and control parts of the source code can be considered part of the optimizer. To avoid confusion, I am going to call the next set of functions the preparatory stage of the optimizer. The first of these preparatory functions is the mysql_execute_command() function (located in /sql/sql_parse.cc). The name leads you to believe you are actually executing the query, but that isn t the case. This function performs much of the setup steps necessary to optimize the query. The LEX structure is copied and several variables are set to help the query optimization and later execution. You can see some of these operations in a condensed view of the function shown in Listing 3-9. Listing 3-9. The mysql_execute_command() Function bool mysql_execute_command(THD *thd) { bool res= FALSE; int result= 0; LEX *lex= thd->lex; /* first SELECT_LEX (have special meaning for many of non-SELECTcommands) */ SELECT_LEX *select_lex= &lex->select_lex; /* first table of first SELECT_LEX */ TABLE_LIST *first_table= (TABLE_LIST*) select_lex->table_list.first;

The simplest form of a sequence expression is seq { for value in expr .. expr -> expr }. Here, -> should be read yield. This is a shorthand way of writing Seq.map over a range expression. For example, you can generate an enumeration of numbers and their squares as follows: > let squares = seq { for i in 0 .. 10 -> (i,i*i) };; val squares : seq<int * int> > squares;; val it : seq<int * int> = [ (0,0); (1,1); (2,4); (3,9); ... ] The more complete form of this construct is seq { for pattern in seq -> expression }. The pattern allows you to decompose the values yielded by the input enumerable. For example, you can consume the elements of squares using the pattern (i,iSquared):

"It is easy to read." |]

/* list of all tables in query */ TABLE_LIST *all_tables; /* most outer SELECT_LEX_UNIT of query */ SELECT_LEX_UNIT *unit= &lex->unit; /* Saved variable value */ DBUG_ENTER("mysql_execute_command"); thd->net.no_send_error= 0; ... switch (lex->sql_command) { case SQLCOM_SELECT: { ... select_result *result=lex->result; ... res= check_access(thd, lex->exchange SELECT_ACL | FILE_ACL : SELECT_ACL, any_db, 0, 0, 0, 0); ... if (!(res= open_and_lock_tables(thd, all_tables))) { if (lex->describe) { /* We always use select_send for EXPLAIN, even if it's an EXPLAIN for SELECT ... INTO OUTFILE: a user application should be able to prepend EXPLAIN to any query and receive output for it, even if the query itself redirects the output. */ ... query_cache_store_query(thd, all_tables); res= handle_select(thd, lex, result, 0); ... } There are a number of interesting things happening in this function. You will notice another switch statement that has as its cases the SQLCOM keywords. In the case of the example query, you saw the parser set the lex->sql_command member variable to SQLCOM_SELECT. I have included a

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