Zhen Chen created CALCITE-6938:
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Summary: Support zero value creation of nested data types
Key: CALCITE-6938
URL: https://issues.apache.org/jira/browse/CALCITE-6938
Project: Calcite
Issue Type: Improvement
Reporter: Zhen Chen
Assignee: Zhen Chen
This implementation ensures zero values of various nested data types can be
used in {{COALESCE(nestedCol, nestedZero)}} expressions.
Basic Nested Types:
# ARRAY: Zero value represented as an zero array. e.g. ARRAY<INTEGER> →
ARRAY[0]
# MULTISET: Zero value represented as an zero multiset. e.g. MULTISET<INTEGER>
→ MULTISET[0]
# MAP: Zero value represented as an zero map. e.g. MAP<INTEGER, INTEGER> →
MAP(0, 0)
# ROW: Zero value with all fields initialized to their respective type's zero
value. e.g. ROW<INTEGER, INTEGER> → ROW(0, 0)
Complex Nested Types:
* {{ARRAY<ARRAY<INTEGER>>}}
* {{ARRAY<MAP<VARCHAR(50), INTEGER>>}}
* {{MAP<STRING, ARRAY<ROW<INT, BOOLEAN>>>}}
* ......
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