@Override public String visitLiteral(RexLiteral rexLiteral) { Object v = rexLiteral.getValue(); RelDataType ty = rexLiteral.getType(); switch (rexLiteral.getTypeName()) { case BOOLEAN: return v.toString(); case CHAR: return CompilerUtil.escapeJavaString(((NlsString) v).getValue(), true); case NULL: return "((" + ((Class<?>) typeFactory.getJavaClass(ty)).getCanonicalName() + ")null)"; case DOUBLE: case BIGINT: case DECIMAL: switch (ty.getSqlTypeName()) { case TINYINT: case SMALLINT: case INTEGER: return Long.toString(((BigDecimal) v).longValueExact()); case BIGINT: return Long.toString(((BigDecimal) v).longValueExact()) + 'L'; case DECIMAL: case FLOAT: case REAL: case DOUBLE: return Util.toScientificNotation((BigDecimal) v); } break; default: throw new UnsupportedOperationException(); } return null; }