transpiler/src/main/java/com/google/cloud/verticals/foundations/dataharmonization/Transpiler.java [484:499]:
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    FunctionReference opRef = Functions.getOperatorRef(op);
    FunctionCall call =
        Functions.getSignature(opRef, 1)
            .transpileFunctionCall(this, opRef, Collections.singletonList(ctx.expression()), ctx);

    return rebuildFunctionCallWithIterationSupport(sourceMeta(buildSource(ctx)), call);
  }

  /**
   * Visit a parse tree produced by the {@code ExprPostfixOp} labeled alternative in
   * WhistleParser#expression.
   *
   * @param ctx the parse tree
   * @return the visitor result
   */
  @Override
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transpiler/src/main/java/com/google/cloud/verticals/foundations/dataharmonization/Transpiler.java [502:517]:
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    FunctionReference opRef = Functions.getOperatorRef(op);
    FunctionCall call =
        Functions.getSignature(opRef, 1)
            .transpileFunctionCall(this, opRef, Collections.singletonList(ctx.expression()), ctx);

    return rebuildFunctionCallWithIterationSupport(sourceMeta(buildSource(ctx)), call);
  }

  /**
   * Visit a parse tree produced by the {@code ExprBlock} labeled alternative in
   * WhistleParser#expression.
   *
   * @param ctx the parse tree
   * @return the visitor result
   */
  @Override
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