Examples with ResolvedFunctionCall com.google.zetasql.resolvedast.ResolvedNodes.ResolvedFunctionCall used on opensource projects

Example 1 with ResolvedFunctionCall

use of com.google.zetasql.resolvedast.ResolvedNodes.ResolvedFunctionCall in project beam by apache.

the class ExpressionConverter method convertRexNodeFromComputedColumnWithFieldList.

private RexNode convertRexNodeFromComputedColumnWithFieldList(ResolvedComputedColumn column, List<ResolvedColumn> columnList, List<RelDataTypeField> fieldList, int windowFieldIndex) {
    if (column.getExpr().nodeKind() != RESOLVED_FUNCTION_CALL) {
        return convertRexNodeFromResolvedExpr(column.getExpr(), columnList, fieldList, ImmutableMap.of());
    }
    ResolvedFunctionCall functionCall = (ResolvedFunctionCall) column.getExpr();
    // TODO: is there any other illegal case?
    if (functionCall.getFunction().getName().equals(FIXED_WINDOW) || functionCall.getFunction().getName().equals(SLIDING_WINDOW) || functionCall.getFunction().getName().equals(SESSION_WINDOW)) {
        throw new ZetaSqlException(functionCall.getFunction().getName() + " shouldn't appear in SELECT exprlist.");
    }
    if (!functionCall.getFunction().getGroup().equals(PRE_DEFINED_WINDOW_FUNCTIONS)) {
        // non-window function should still go through normal FunctionCall conversion process.
        return convertRexNodeFromResolvedExpr(column.getExpr(), columnList, fieldList, ImmutableMap.of());
    }
    // ONLY window_start and window_end should arrive here.
    // TODO: Have extra verification here to make sure window start/end functions have the same
    // parameter with window function.
    List<RexNode> operands = new ArrayList<>();
    switch(functionCall.getFunction().getName()) {
        case FIXED_WINDOW_START:
        case SLIDING_WINDOW_START:
        case SESSION_WINDOW_START:
        // in Calcite.
        case SESSION_WINDOW_END:
            return rexBuilder().makeInputRef(fieldList.get(windowFieldIndex).getType(), windowFieldIndex);
        case FIXED_WINDOW_END:
            operands.add(rexBuilder().makeInputRef(fieldList.get(windowFieldIndex).getType(), windowFieldIndex));
            // TODO: check window_end 's duration is the same as it's aggregate window.
            operands.add(convertIntervalToRexIntervalLiteral((ResolvedLiteral) functionCall.getArgumentList().get(0)));
            return rexBuilder().makeCall(SqlOperators.ZETASQL_TIMESTAMP_ADD, operands);
        case SLIDING_WINDOW_END:
            operands.add(rexBuilder().makeInputRef(fieldList.get(windowFieldIndex).getType(), windowFieldIndex));
            operands.add(convertIntervalToRexIntervalLiteral((ResolvedLiteral) functionCall.getArgumentList().get(1)));
            return rexBuilder().makeCall(SqlOperators.ZETASQL_TIMESTAMP_ADD, operands);
        default:
            throw new UnsupportedOperationException("Does not support window start/end: " + functionCall.getFunction().getName());
    }
}