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SQL Parser (C++)
==========
C++ SQL Parser for Hyrise
=========================
This is a SQL Parser for C++. It parses the given SQL query into C++ objects.
It is developed for integration in hyrise (https://github.com/hyrise/hyrise), but can be used in other environments as well.
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To use the SQL Parser in your own code, you only need to include `SQLParser.h` and build+link all the source files from the parser with your project. See `hyrise/src/lib/access/sql/SQLQueryParser.cpp` for how it's used in Hyrise.
### Run tests
**Important:** Execute all tests by calling `make test`.
To execute all tests run: `./run_tests.sh`.
### Documentation
### Update in Hyrise
Run `./deploy_to_hyris.sh path/to/hyrise` to update the SQL parser within Hyrise.
### Capabilities (Can and Can't do)
**Can**
* Single select statements
* Join expressions
* Create tables
* Insert statements
* Delete/Truncate statements
**Can't (yet)**
* Having clause
* Update statements
* Union clauses
* Create anything other than tables
* Alter/Rename statements
* [Developer Documentation](docs/documentation.md)
* [Integration in Hyrise](docs/integration.md)
* [Known Issues](docs/issues.md)

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# Developer Documentation
Developer Documentation
=======================
This page contains information about how to extend this parser with new functionalities.
## Extending the Grammar
TODO
## Implementing Statement Class
TODO
Create a new file and class in src/lib/statements/ or extend any of the existing Statements. Every statement needs to have the base class SQLStatement and needs to call its super constructor with its type. If your defining a new statement type, you need to define a new StatementType in SQLStatement.h.
It is important that you create an appropriate constructor for your statement that zero-initializes all its pointer variables and that your create an appropriate destructor.
Lastly you need to include your new file in src/lib/sqllib.h
## Extending the Grammar
Related files:
* src/parser/bison_parser.y
* src/parser/flex_lexer.l
* src/parser/keywordlist_generator.py
* src/parser/sql_keywords.txt
To extend the grammar the file you will mostly have to deal with is the bison grammar definition in src/parser/bison_parser.y.
If your extending an existing statement, skip to the non-terminal definition for that statement. I.e. for an InsertStatement the non-terminal insert_statement.
If your defining a new statement, you will need to define your type in the \%union directive `hsql::ExampleStatement example_stmt`. Next you need to associate this type with a non-terminal `\%type <example_stmt> example_statement`. Then you have to define the non-terminal `example_statement`. Look the other non-terminals for statements to figure out how.
## Implementing Tests
TODO
Related files:
* src/sql_tests.cpp

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Integration in Hyrise
=====================
## Update the Parser in Hyrise
Run `./deploy_to_hyrise.sh path/to/hyrise` to update the SQL parser code within Hyrise.

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Known Issues
============
## Missing Functionality
* Having clause
* Union clauses
* Create anything other than tables
* Alter/Rename statements