QueryExpression
===============

.. cpp:class:: numpy::QueryExpression

   numpy C++ class.

Example
-------

.. code-block:: cpp

   #include <numpy/np_ndarray.h>
   using namespace numpy;

   // Use QueryExpression
   QueryExpression obj;
   // ... operations ...

Constructors
------------

.. list-table::
   :widths: 55 25 20
   :header-rows: 1

   * - Signature
     - Location
     - Example
   * - ``QueryExpression(const std::string& expr)``
     - df_query.h:472
     - 

Other Methods
-------------

.. list-table::
   :widths: 40 20 15 25
   :header-rows: 1

   * - Signature
     - Return Type
     - Location
     - Example
   * - ``void collect_columns(const ASTNode\* node)``
     - void
     - df_query.h:442
     - 
   * - ``collect_columns(and_node->left.get())``
     - 
     - df_query.h:453
     - 
   * - ``collect_columns(and_node->right.get())``
     - 
     - df_query.h:454
     - 
   * - ``collect_columns(or_node->left.get())``
     - 
     - df_query.h:459
     - 
   * - ``collect_columns(or_node->right.get())``
     - 
     - df_query.h:460
     - 
   * - ``collect_columns(not_node->operand.get())``
     - 
     - df_query.h:465
     - 
   * - ``collect_columns(root\_.get())``
     - 
     - df_query.h:477
     - 
   * - ``Lexer lexer(expr)``
     - Lexer
     - df_query.h:473
     - 
   * - ``Parser parser(std::move(tokens))``
     - Parser
     - df_query.h:475
     - 
   * - ``const std::unordered_set<std::string>& referenced_columns() const``
     - const std::unordered_set<std::string>&
     - df_query.h:482
     - 
   * - ``const ASTNode\* root() const``
     - const ASTNode\*
     - df_query.h:480
     -