Class SqlTrimFunction


public class SqlTrimFunction extends SqlFunction
Definition of the "TRIM" builtin SQL function.
  • Field Details

  • Constructor Details

  • Method Details

    • unparse

      public void unparse(SqlWriter writer, SqlCall call, int leftPrec, int rightPrec)
      Description copied from class: SqlOperator
      Writes a SQL representation of a call to this operator to a writer, including parentheses if the operators on either side are of greater precedence.

      The default implementation of this method delegates to SqlSyntax.unparse(org.apache.calcite.sql.SqlWriter, org.apache.calcite.sql.SqlOperator, org.apache.calcite.sql.SqlCall, int, int).

      Overrides:
      unparse in class SqlFunction
    • getSignatureTemplate

      public String getSignatureTemplate(int operandsCount)
      Description copied from class: SqlOperator
      Returns a template describing how the operator signature is to be built. E.g for the binary + operator the template looks like "{1} {0} {2}" {0} is the operator, subsequent numbers are operands.
      Overrides:
      getSignatureTemplate in class SqlOperator
      Parameters:
      operandsCount - is used with functions that can take a variable number of operands
      Returns:
      signature template, or null to indicate that a default template will suffice
    • createCall

      public SqlCall createCall(@Nullable SqlLiteral functionQualifier, SqlParserPos pos, @Nullable SqlNode... operands)
      Description copied from class: SqlOperator
      Creates a call to this operator with an array of operands.

      The position of the resulting call is the union of the pos and the positions of all of the operands.

      Overrides:
      createCall in class SqlOperator
      Parameters:
      functionQualifier - Function qualifier (e.g. "DISTINCT"), or null
      pos - Parser position of the identifier of the call
      operands - Array of operands
    • checkOperandTypes

      public boolean checkOperandTypes(SqlCallBinding callBinding, boolean throwOnFailure)
      Description copied from class: SqlOperator
      Checks that the operand values in a SqlCall to this operator are valid. Subclasses must either override this method or supply an instance of SqlOperandTypeChecker to the constructor.
      Overrides:
      checkOperandTypes in class SqlOperator
      Parameters:
      callBinding - description of call
      throwOnFailure - whether to throw an exception if check fails (otherwise returns false in that case)
      Returns:
      whether check succeeded