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Task Cascades for Efficient Unstructured Data Processing

Summary: Task cascades generalize model cascades for LLM-based document processing by varying not only the model, but also the queried span and even the operation, exploiting simpler correlated sub-tasks and partial evidence. An iterative optimizer plus statistical accuracy guarantees yields 36% lower cost than standard cascades at 90% target accuracy. (summarized by gpt-5.4-mini on Apr 11 2026)

Paper ID
h28d777b45af3f14d
Venue
SIGMOD
Year
2026
Pagerank
5.0599411e-05
Overall Rank
10,198 | 31.46%
DOI
10.1145/3786702
PDF
Download (CC BY 4.0)

Incoming Non-self Citations Over Time

Authors

BibTeX Citation

@inproceedings{shankar_sigmod26,
        title = {{Task Cascades for Efficient Unstructured Data Processing}},
        author = {Shankar, Shreya and Zeighami, Sepanta and Parameswaran, Aditya G.},
        series = {{SIGMOD} '26},
        booktitle = {Proceedings of the {ACM} {SIGMOD} International Conference on Management of Data},
        publisher = {Association for Computing Machinery},
        doi = {10.1145/3786702},
        url = {https://dl.acm.org/doi/10.1145/3786702},
        year = {2026}
}

Incoming Citations (Sorted by Pagerank)

Showing 2 of 2 citing papers.

Rank Citing Paper Year Venue Pagerank
6,607 Multi-Objective Agentic Rewrites for Unstructured Data Processing 2026 VLDB 5.73539e-05
10,351 Evergreen: Efficient Claim Verification for Semantic Aggregates 2027 VLDB 4.9769913e-05
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Outgoing Citations (Sorted by Pagerank)

Showing 29 of 29 cited papers.

Citations counted here include only citations to other VLDB/SIGMOD/CIDR/PODS papers in this database.

Rank Cited Paper Year Venue Pagerank
125 Predicate Migration: Optimizing Queries with Expensive Predicates 1993 SIGMOD 0.00030462671
271 NoScope: Optimizing Neural Network Queries over Video at Scale 2017 VLDB 0.0002256866
282 Accelerating Machine Learning Inference with Probabilistic Predicates 2018 SIGMOD 0.00022302793
372 Approximate Query Processing: Taming the TeraBytes! A Tutorial 2001 VLDB 0.0001971778
496 Language Models Enable Simple Systems for Generating Structured Views of Heterogeneous Data Lakes 2024 VLDB 0.00017318538
518 Random Sampling for Histogram Construction: How much is enough? 1998 SIGMOD 0.00016938992
541 BlazeIt: Optimizing Declarative Aggregation and Limit Queries for Neural Network-Based Video Analytics 2020 VLDB 0.00016663833
655 CAESURA: Language Models as Multi-Modal Query Planners 2024 CIDR 0.00015090153
658 DocETL: Agentic Query Rewriting and Evaluation for Complex Document Processing 2025 VLDB 0.00015058738
717 Palimpzest: Optimizing AI-Powered Analytics with Declarative Query Processing 2025 CIDR 0.00014528323
1,061 Approximate Query Processing: No Silver Bullet 2017 SIGMOD 0.00012208639
2,037 LLM-R^2: A Large Language Model Enhanced Rule-based Rewrite System for Boosting Query Efficiency 2025 VLDB 9.1494269e-05
2,273 The Design of an LLM-powered Unstructured Analytics System 2025 CIDR 8.7093949e-05
2,295 ThalamusDB: Approximate Query Processing on Multi-Modal Data 2024 SIGMOD 8.6822982e-05
2,773 Approximate Selection with Guarantees using Proxies 2020 VLDB 8.0318294e-05
2,909 Semantic Operators and Their Optimization: Enabling LLM-Based Data Processing with Accuracy Guarantees in LOTUS 2025 VLDB 7.8705905e-05
3,049 Abacus: A Cost-Based Optimizer for Semantic Operator Systems 2026 VLDB 7.7087759e-05
3,640 TASTI: Semantic Indexes for Machine Learning-based Queries over Unstructured Data 2022 SIGMOD 7.1410511e-05
3,756 Accelerating Approximate Aggregation Queries with Expensive Predicates 2021 VLDB 7.0456217e-05
3,877 FiGO: Fine-Grained Query Optimization in Video Analytics 2022 SIGMOD 6.9496983e-05
3,924 Pneuma: Leveraging LLMs for Tabular Data Representation and Retrieval in an End-to-End System 2025 SIGMOD 6.9195146e-05
4,133 AOP: Automated and Interactive LLM Pipeline Orchestration for Answering Complex Queries 2025 CIDR 6.7850201e-05
4,479 Filtering with Approximate Predicates 1998 VLDB 6.5797399e-05
5,208 ELEET: Efficient Learned Query Execution over Text and Tables 2024 VLDB 6.2254341e-05
6,777 VectraFlow: Integrating Vectors into Stream Processing 2025 CIDR 5.6833587e-05
6,857 SpareLLM: Automatically Selecting Task-Specific Minimum-Cost Large Language Models under Equivalence Constraint 2025 SIGMOD 5.6621524e-05
7,398 Accelerating Aggregation Queries on Unstructured Streams of Data 2023 VLDB 5.5342864e-05
8,306 ThriftLLM: On Cost-Effective Selection of Large Language Models for Classification Queries 2025 VLDB 5.3581613e-05
8,620 A Learned Query Rewrite System 2023 VLDB 5.3001197e-05
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