Function flattenInput

bolt/expression/ExprCompiler.cpp:164–175

Recursively flattens nested ANDs, ORs or eligible callable expressions into a vector of their inputs. Recursive flattening ceases exploring an input branch if it encounters either an expression different from 'flattenCall' or its inputs are not the same type. Examples: flattenCall: AND in: a AND (b AND (c AND d)) out: [a, b, c, d] flattenCall: OR in: (a OR b) OR (c OR d) out: [a, b, c, d] flatte

// in: (array1, concat(array2, concat(array2, intVal))
// out: [array1, array2, concat(array2, intVal)]
void flattenInput(
    const TypedExprPtr& input,
    const std::string& flattenCall,
    std::vector<TypedExprPtr>& flat) {
  if (isCall(input, flattenCall) && allInputTypesEquivalent(input)) {
    for (auto& child : input->inputs()) {
      flattenInput(child, flattenCall, flat);
    }
  } else {
    flat.emplace_back(input);
  }
}

ExprPtr getAlreadyCompiled(const ITypedExpr* expr, ExprDedupMap* visited) {
  auto iter = visited->find(expr);