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Parquet Export and Import when Columns are in Different Order
My source and destination tables have the same columns but with different order.
I know it is possible to specify column names in specific order when exporting the data.
Is it also possible to specify columns in specific order when importing data?
I saw specifying the column in copy command "COPY some_parq_data(c3, c2)" works. However, I found out that I'm getting files from different sources and each has a different column order. Is there something that can be put inside the file to indicate the order of columns such as a first row that contains column names in the right order0
cat data.csv f2,f1,f3 2,1,3 5,4,6 8,7,9 CREATE TABLE t1( f1 INT, f2 INT, f3 INT); COPY t1 FROM '/YourFilePath/data.csv' parser FDELIMITEDPARSER() DELIMITER ',' ABORT ON ERROR; SELECT * FROM t1 ORDER BY 1; f1 | f2 | f3 ----+----+---- 1 | 2 | 3 4 | 5 | 6 7 | 8 | 9 (3 rows)0
@avi120 : Yes you can export specific columns. However when importing you need to import all those columns
Check out the feature Loose Schema Matching introduced in Vertica 10.1.1 !
@avi120 - Here is a better example of using do_soft_schema_match_by_name:
Thank you @mosheg and @Jim_Knicely.
Since I'm using version 9.2 I ended up using FDELIMITEDPARSER parser. Once we upgrade to version 10 we will experiment with do_soft_schema_match_by_name