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The query option PARQUET_FALLBACK_SCHEMA_RESOLUTION allows matching of Parquet fields by name instead of by index (the default). Parquet column names are case sensitive, but Impala treats db/table/column/field names as case-insensitive. Today, there is no way today to select Parquet columns with mixed casing via SQL using the name-based field resolution policy. This patch changes the matching of Parquet fields to be case-insensitive. Testing: - Modified the data files backing complextypestbl to contain fields with mixed casing. - Several existing tests run against this table, including the test for name-based resolution. - I confirmed that without this fix, the existing name-based resolution tests fail on the modified data files. - I locally ran test_scanners.py and test_nested_types.py on exhaustive with this fix. Change-Id: I87395f84ba29b4c3d8e41be1ea4e89e500b8a9f4 Reviewed-on: http://gerrit.cloudera.org:8080/5891 Reviewed-by: Alex Behm <alex.behm@cloudera.com> Tested-by: Impala Public Jenkins
33 lines
1.5 KiB
JSON
33 lines
1.5 KiB
JSON
{"type": "record",
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"namespace": "org.apache.impala",
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"name": "ComplexTypesTbl",
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/* Field names have mixed casing to test the case-insensitive matching of
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fields in Parquet files. */
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"fields": [
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{"name": "ID", "type": "long"},
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{"name": "Int_Array", "type": {"type": "array", "items": "int"}},
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{"name": "int_array_array", "type": {"type": "array", "items":
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{"type": "array", "items": "int"}}},
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{"name": "Int_Map", "type": {"type": "map", "values": "int"}},
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{"name": "int_map_array", "type": {"type": "array", "items":
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{"type": "map", "values": "int"}}},
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{"name": "nested_Struct", "type":
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{"type": "record", "name": "r1", "fields": [
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{"name": "a", "type": "int"},
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{"name": "B", "type": {"type": "array", "items": "int"}},
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{"name": "c", "type": {"type": "record", "name": "r2", "fields": [
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{"name": "D", "type": {"type": "array", "items":
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{"type": "array", "items":
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{"type": "record", "name": "r3", "fields": [
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{"name": "e", "type": "int"},
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{"name": "f", "type": "string"}]}}}}
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]}},
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{"name": "G", "type": {"type": "map", "values": {
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"type": "record", "name": "r4", "fields": [
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{"name": "h", "type": {"type": "record", "name": "r5", "fields": [
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{"name": "i", "type": {"type": "array", "items": "double"}}]}}
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]}}}
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]}}
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]
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}
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