================================================================================
string
================================================================================
SELECT 'hello';
--------------------------------------------------------------------------------

(source_file
  (select_statement
    (select_item
      (string))))

================================================================================
nested select
================================================================================
SELECT (SELECT 'hello');
--------------------------------------------------------------------------------

(source_file
  (select_statement
    (select_item
      (select_statement
        (select_item
          (string))))))

================================================================================
many
================================================================================
SELECT 1234, -25, TRUE, FALSE, NULL, *;
--------------------------------------------------------------------------------

(source_file
  (select_statement
    (select_item
      (number))
    (select_item
      (op_expression
        (minus)
        (number)))
    (select_item
      (true))
    (select_item
      (false))
    (select_item
      (null))
    (select_item
      (star))))

================================================================================
identifiers
================================================================================
SELECT foo, foo.bar;
--------------------------------------------------------------------------------

(source_file
  (select_statement
    (select_item
      (identifier))
    (select_item
      (identifier))))

================================================================================
binary_expression
================================================================================
SELECT a + b - c / d * e % f;
--------------------------------------------------------------------------------

(source_file
  (select_statement
    (select_item
      (op_expression
        (op_expression
          (identifier)
          (identifier))
        (op_expression
          (op_expression
            (op_expression
              (identifier)
              (identifier))
            (identifier))
          (identifier))))))

================================================================================
unary prec over binary
================================================================================
SELECT -22 + - (5 + 1);
--------------------------------------------------------------------------------

(source_file
  (select_statement
    (select_item
      (op_expression
        (op_expression
          (minus)
          (number))
        (op_expression
          (minus)
          (op_expression
            (number)
            (number)))))))

================================================================================
nested parens
================================================================================
SELECT ((((24 + 24))));
--------------------------------------------------------------------------------

(source_file
  (select_statement
    (select_item
      (op_expression
        (number)
        (number)))))

================================================================================
logical expressions
================================================================================
SELECT 1 - 2 AND TRUE OR (5 = 2);
--------------------------------------------------------------------------------

(source_file
  (select_statement
    (select_item
      (op_expression
        (op_expression
          (op_expression
            (number)
            (number))
          (and)
          (true))
        (or)
        (op_expression
          (number)
          (comparison_op)
          (number))))))

================================================================================
function call
================================================================================
SELECT foo.bar(param) + baz();
--------------------------------------------------------------------------------

(source_file
  (select_statement
    (select_item
      (op_expression
        (function_call
          (identifier)
          (identifier))
        (function_call
          (identifier))))))

================================================================================
nested function call
================================================================================
SELECT coalesce(null, nullif(false, true), ops.my_fn(5));
--------------------------------------------------------------------------------

(source_file
  (select_statement
    (select_item
      (function_call
        (identifier)
        (null)
        (function_call
          (identifier)
          (false)
          (true))
        (function_call
          (identifier)
          (number))))))

================================================================================
casting
================================================================================
SELECT 1::text;
--------------------------------------------------------------------------------

(source_file
  (select_statement
    (select_item
      (op_expression
        (number)
        (cast)
        (identifier)))))

================================================================================
string concatenation
================================================================================
SELECT 'hello' || 1 || now();
--------------------------------------------------------------------------------

(source_file
  (select_statement
    (select_item
      (op_expression
        (op_expression
          (string)
          (other_op)
          (number))
        (other_op)
        (function_call
          (identifier))))))

================================================================================
string quote
================================================================================
SELECT 'hello' || 'quote''s everywh''ere';
--------------------------------------------------------------------------------

(source_file
  (select_statement
    (select_item
      (op_expression
        (string)
        (other_op)
        (string)))))

================================================================================
is null, isnull, is not null, notnull
================================================================================
SELECT
    foo is null,
    foo is not null,
    foo isnull,
    foo notnull;
--------------------------------------------------------------------------------

(source_file
  (select_statement
    (select_item
      (op_expression
        (identifier)
        (comparison_null)))
    (select_item
      (op_expression
        (identifier)
        (comparison_null)))
    (select_item
      (op_expression
        (identifier)
        (comparison_null)))
    (select_item
      (op_expression
        (identifier)
        (comparison_null)))))

================================================================================
time expressions
================================================================================
SELECT
    foo::interval,
    foo at time zone 'utc',
    interval '1 day',
    interval '1' hour to second,
    interval '1' day + interval '3' month;
--------------------------------------------------------------------------------

(source_file
  (select_statement
    (select_item
      (op_expression
        (identifier)
        (cast)
        (identifier)))
    (select_item
      (time_expression
        (identifier)
        (string)))
    (select_item
      (time_expression
        (string)))
    (select_item
      (time_expression
        (string)))
    (select_item
      (op_expression
        (time_expression
          (string))
        (time_expression
          (string))))))