Package org.apache.calcite.test

Class SqlOperatorTest

java.lang.Object
org.apache.calcite.test.SqlOperatorTest
public class SqlOperatorTest extends Object
Contains unit tests for all operators. Each of the methods is named after an operator.

To run, you also need an execution mechanism: parse, validate, and execute expressions on the operators. This is left to a SqlTester object which is obtained via the fixture() method. The default tester merely validates calls to operators, but CalciteSqlOperatorTest uses a tester that executes calls and checks that results are valid.

Different implementations of SqlTester are possible, such as:

  • Execute against a JDBC database;
  • Parse and validate but do not evaluate expressions;
  • Generate a SQL script;
  • Analyze which operators are adequately tested.

A typical method will be named after the operator it is testing (say testSubstringFunc). It first calls SqlOperatorFixture.setFor(SqlOperator, VmName...) to declare which operator it is testing. 


 public void testSubstringFunc() {
     tester.setFor(SqlStdOperatorTable.substringFunc);
     tester.checkScalar("sin(0)", "0");
     tester.checkScalar("sin(1.5707)", "1");
 }

The rest of the method contains calls to the various checkXxx methods in the SqlTester interface. For an operator to be adequately tested, there need to be tests for:

  • Parsing all of its the syntactic variants.
  • Deriving the type of in all combinations of arguments.
    • Pay particular attention to nullability. For example, the result of the "+" operator is NOT NULL if and only if both of its arguments are NOT NULL.
    • Also pay attention to precision/scale/length. For example, the maximum length of the "||" operator is the sum of the maximum lengths of its arguments.
  • Executing the function. Pay particular attention to corner cases such as null arguments or null results.

  • Field Details

    • TESTER

      public static final SqlOperatorTest.TesterImpl TESTER

    • TODO

      public static final boolean TODO
      See Also:

    • TIME_PATTERN

      public static final Pattern TIME_PATTERN
      Regular expression for a SQL TIME(0) value.

    • TIMESTAMP_PATTERN

      public static final Pattern TIMESTAMP_PATTERN
      Regular expression for a SQL TIMESTAMP(0) value.

    • DATE_PATTERN

      public static final Pattern DATE_PATTERN
      Regular expression for a SQL DATE value.

    • MICROSECOND_VARIANTS

      public static final List<String> MICROSECOND_VARIANTS

    • NANOSECOND_VARIANTS

      public static final List<String> NANOSECOND_VARIANTS

    • SECOND_VARIANTS

      public static final List<String> SECOND_VARIANTS

    • MINUTE_VARIANTS

      public static final List<String> MINUTE_VARIANTS

    • HOUR_VARIANTS

      public static final List<String> HOUR_VARIANTS

    • DAY_VARIANTS

      public static final List<String> DAY_VARIANTS

    • WEEK_VARIANTS

      public static final List<String> WEEK_VARIANTS

    • MONTH_VARIANTS

      public static final List<String> MONTH_VARIANTS

    • QUARTER_VARIANTS

      public static final List<String> QUARTER_VARIANTS

    • YEAR_VARIANTS

      public static final List<String> YEAR_VARIANTS

    • UTC_TZ

      protected static final TimeZone UTC_TZ

    • LOCAL_TZ

      protected static final TimeZone LOCAL_TZ

    • CURRENT_TZ

      protected static final TimeZone CURRENT_TZ

    • DECIMAL

      public static final boolean DECIMAL
      Whether DECIMAL type is implemented.
      See Also:

  • Constructor Details

    • SqlOperatorTest

      public SqlOperatorTest()

  • Method Details

    • fixture

      protected SqlOperatorFixture fixture()
      Sub-classes should override to run tests in a different environment.

    • getCalendarNotTooNear

      protected static Calendar getCalendarNotTooNear(int timeUnit)
      Returns a Calendar that is the current time, pausing if we are within 2 minutes of midnight or the top of the hour.
      Parameters:
      timeUnit - Time unit
      Returns:
      calendar

    • testJsonInsert

      @Test public void testJsonInsert()

    • testJsonReplace

      @Test public void testJsonReplace()

    • testJsonSet

      @Test public void testJsonSet()

    • currentTimeString

      protected static Pair<String,Hook.Closeable> currentTimeString(TimeZone tz)
      Returns a time string, in GMT, that will be valid for at least 2 minutes.

      For example, at "2005-01-01 12:34:56 PST", returns "2005-01-01 20:". At "2005-01-01 12:34:59 PST", waits a minute, then returns "2005-01-01 21:".

      Parameters:
      tz - Time zone
      Returns:
      Time string