org.eigenbase.sql2rel
Interface SqlNodeToRexConverter

All Known Implementing Classes:

SqlNodeToRexConverterImpl

public interface SqlNodeToRexConverter

Converts expressions from SqlNode to RexNode.

Method Summary

RexNode	convertCall(SqlRexContext cx, SqlCall call) Converts a SqlCall to a RexNode expression.
RexLiteral	convertInterval(SqlRexContext cx, SqlIntervalQualifier intervalQualifier) Converts a SQL Interval Qualifier to a REX literal.
RexNode	convertLiteral(SqlRexContext cx, SqlLiteral literal) Converts a SQL literal to a REX literal.

Method Detail

convertCall

RexNode convertCall(SqlRexContext cx,
                    SqlCall call)

Converts a SqlCall to a RexNode expression.

convertLiteral

RexNode convertLiteral(SqlRexContext cx,
                       SqlLiteral literal)

Converts a SQL literal to a REX literal.

The result is RexNode, not RexLiteral because if the literal is NULL (or the boolean Unknown value), we make a CAST(NULL AS type) expression.

convertInterval

RexLiteral convertInterval(SqlRexContext cx,
                           SqlIntervalQualifier intervalQualifier)

Converts a SQL Interval Qualifier to a REX literal.