错误现象：
sql_lex.cc: In function `void lex_init()":
sql_lex.cc:85: `symbols" undeclared (first use this function)
sql_lex.cc:85: (Each undeclared identifIEr is reported only once
sql_lex.cc:85: for each function it appears in.)
sql_lex.cc:87: `sql_functions" undeclared (first use this function)
sql_lex.cc: In function `int find_keyWord(LEX *, unsigned int, bool)":
sql_lex.cc:171: implicit declaration of function `int get_hash_symbol(...)"
sql_lex.cc:171: initialization to `SYMBOL *" from `int" lacks a cast

解决办法：
cd sql
make gen_lex_hash
./gen_lex_hash > lex_hash.h
make

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