Class SqlUnknownLiteral

All Implemented Interfaces:

public class SqlUnknownLiteral extends SqlLiteral
Literal whose type is not yet known.
  • Field Details

    • tag

      public final String tag
  • Method Details

    • getValue

      public String getValue()
      Description copied from class: SqlLiteral
      Returns the value of this literal.

      Try not to use this method! There are so many different kinds of values, it's better to to let SqlLiteral do whatever it is you want to do.

      getValue in class SqlLiteral
      See Also:
    • clone

      public SqlLiteral clone(SqlParserPos pos)
      Description copied from class: SqlNode
      Clones a SqlNode with a different position.
      clone in class SqlLiteral
    • unparse

      public void unparse(SqlWriter writer, int leftPrec, int rightPrec)
      Description copied from class: SqlNode
      Writes a SQL representation of this node to a writer.

      The leftPrec and rightPrec parameters give us enough context to decide whether we need to enclose the expression in parentheses. For example, we need parentheses around "2 + 3" if preceded by "5 *". This is because the precedence of the "*" operator is greater than the precedence of the "+" operator.

      The algorithm handles left- and right-associative operators by giving them slightly different left- and right-precedence.

      If SqlWriter.isAlwaysUseParentheses() is true, we use parentheses even when they are not required by the precedence rules.

      For the details of this algorithm, see SqlCall.unparse(org.apache.calcite.sql.SqlWriter, int, int).

      unparse in class SqlLiteral
      writer - Target writer
      leftPrec - The precedence of the SqlNode immediately preceding this node in a depth-first scan of the parse tree
      rightPrec - The precedence of the SqlNode immediately
    • resolve

      public SqlLiteral resolve(SqlTypeName typeName)
      Converts this unknown literal to a literal of known type.