where is the detail code for SQL generating by PCFG?

[DHms2020]

Hi Thanks for the source code. but i'm a little confused about where the detail code for SQL generating by PCFG in the papper "Learning to Synthesize Data for Semantic Parsing". I found the guideline in readme.md mainly focus on the sql2nl I'm doing some experiment about generating some code having different grammar with SQL, your method with PCFG inspire me a lot, could you explain how can we get the new SQL by PCFG, i mean the source code. Thanks!!