What type of Compiler to SQL? Memory-Image (Load-and-Go) Format?

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Hi team,
I am a newbie to the postgres.
When I am studying the compiler,the text book tell me there is there type of compiler.
  1. Assembly Language Format
  2. Relocatable Binary Format
  3. Memory-Image (Load-and-Go) Format
I check the postgres's sql compiler, and it's achieved by lex & yacc.
So What type of Compiler to SQL? Is Memory-Image (Load-and-Go) Format ?

Thanks in advance!

Yours,
WenYi

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