[ISSUE-789] Add string functions TRIM, LPAD, RPAD#811
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Add three scalar string functions to GeaFlow DSL: - trim(str): strip leading/trailing whitespace - lpad(str, len, pad): left-pad string to target length - rpad(str, len, pad): right-pad string to target length Implementation: - Trim.java: extends UDF, supports both String and BinaryString - LPad.java: extends UDF, handles null/empty/truncate edge cases - RPad.java: extends UDF, handles null/empty/truncate edge cases - Registered all three in BuildInSqlFunctionTable.java - Added test SQL + expected output files for each function - Added StringFunctionTest test class Closes apache#789
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What does this PR do?
Closes #789
Adds three string scalar functions to GeaFlow DSL:
trim(str)— strip leading/trailing whitespacelpad(str, len, pad)— left-pad to target lengthrpad(str, len, pad)— right-pad to target lengthKey design decisions
Verification
SELECT trim(' hello '); -- hello
SELECT lpad('hi', 5, 'x'); -- xxxhi
SELECT rpad('hi', 5, 'x'); -- hixxx